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2008 United States presidential election

The 2008 United States presidential election was the 56th quadrennial presidential election, held on November 4, 2008. The Democratic ticket of Barack Obama, the junior senator from Illinois, and Joe Biden, the senior senator from Delaware, defeated the Republican ticket of John McCain, the senior senator from Arizona, and Sarah Palin, the governor of Alaska. Obama became the first African American to be elected to the presidency, as well as being only the third sitting United States senator elected president, joining Warren G. Harding and John F. Kennedy. Meanwhile, this was only the second successful all-senator ticket since the 1960 election and is the only election where both major party nominees were sitting senators. This was the first election since 1952 in which neither the incumbent president nor vice president was on the ballot, as well as the first election since 1928 in which neither ran for the nomination.

Incumbent Republican President George W. Bush was ineligible to pursue a third term due to the term limits established by the Twenty-second Amendment. McCain secured the Republican nomination by March 2008, defeating former governors Mitt Romney, Mike Huckabee, and other challengers. The Democratic primaries were marked by a sharp contest between Obama and the initial front-runner, former first lady and Senator Hillary Clinton, as well as other challengers that dropped out before most of the primaries were held, including Senators John Edwards and Obama's future running mate, Joe Biden. Clinton's victory in the New Hampshire primary made her the first woman to win a major party's presidential primary. After a long primary season, Obama secured the Democratic nomination in June 2008.

Early campaigning focused heavily on the Iraq War and Bush's unpopularity. McCain supported the war, as well as a troop surge that had begun in 2007, while Obama strongly opposed the war. Bush endorsed McCain, but the two did not campaign together, and Bush did not appear in person at the 2008 Republican National Convention. Obama campaigned on the theme that "Washington must change," while McCain emphasized his experience. The campaign was strongly affected by the onset of a major financial crisis, which peaked in September 2008. McCain's decision to suspend his campaign during the height of the financial crisis backfired as voters viewed his response as erratic.

Obama won a decisive victory over McCain, winning the Electoral College and the popular vote by a sizable margin, including states that had not voted for the Democratic presidential candidate since 1976 (North Carolina) and 1964 (Indiana, Virginia, and Nebraska's 2nd congressional district). Obama received the largest share of the popular vote won by a Democrat since Lyndon B. Johnson in 1964 and was the first Democrat to win an outright majority of the popular vote since Jimmy Carter in 1976. Obama flipped nine states that had voted Republican in 2004: Colorado, Florida, Indiana, Iowa, Nevada, New Mexico, North Carolina, Ohio, and Virginia, as well as Nebraska's 2nd congressional district. This also marked the last time a Democrat carried Indiana and North Carolina in a presidential election.

Background

Article Two of the United States Constitution provides that the President and Vice President of the United States must be natural-born citizens of the United States, at least 35 years old, and residents of the United States for a period of at least 14 years. Candidates for the presidency typically seek the nomination of one of the political parties, in which case each party devises a method (such as a primary election) to choose the candidate the party deems best suited to run for the position. Traditionally, the primary elections are indirect elections where voters cast ballots for a slate of party delegates pledged to a particular candidate. The party's delegates then officially nominate a candidate to run on the party's behalf. The general election in November is also an indirect election, where voters cast ballots for a slate of members of the Electoral College; these electors in turn directly elect the president and vice president.

President George W. Bush, a Republican and former Governor of Texas, was ineligible to seek reelection to a third term due to the Twenty-second Amendment; in accordance with Section1 of the Twentieth Amendment, his term expired at noon eastern standard time on January 20, 2009.

Before the primaries
Media speculation had begun almost immediately after the results of the 2004 presidential election were released. In the 2006 midterm elections, the Democrats regained majorities in both houses of the U.S. Congress. Early polls taken before anyone had announced a candidacy had shown Senators Hillary Clinton and Barack Obama as the most popular potential Democratic candidates. Nevertheless, the media speculated on several other candidates, including Al Gore, the runner-up in the 2000 election; John Kerry, the runner-up in the 2004 election; John Edwards, Kerry's running mate in 2004; Delaware Senator Joe Biden; New Mexico Governor Bill Richardson; Iowa Governor Tom Vilsack; and Indiana Senator Evan Bayh.

Edwards was one of the first to formally announce his candidacy for the presidency, on December 28, 2006. This run would be his second attempt at the presidency. Clinton announced intentions to run in the Democratic primaries on January 20, 2007. Obama announced his candidacy on February 10 in his home state of Illinois.

Early primaries and caucuses
Early in the year, the support for Barack Obama started to increase in the polls and he passed Clinton for the top spot in Iowa; he ended up winning the caucus in that state, with Edwards coming in second and Clinton in third. Obama's win was fueled mostly by first time caucus-goers and Independents and showed voters viewed him as the "candidate of change". Iowa has since been viewed as the state that jump-started Obama's campaign and set him on track to win both the nomination and the presidency. After the Iowa caucus, Biden and Connecticut Senator Chris Dodd withdrew from the nomination contest.

Obama became the new front runner in New Hampshire, when his poll numbers skyrocketed after his Iowa victory The Clinton campaign was struggling after a huge loss in Iowa and no strategy beyond the early primaries and caucuses. According to The Vancouver Sun, campaign strategists had "mapped a victory scenario that envisioned the former first lady wrapping up the Democratic presidential nomination by Super Tuesday on Feb. 5." In what is considered a turning point for her campaign, Clinton had a strong performance at the Saint Anselm College, ABC, and Facebook debates several days before the New Hampshire primary as well as an emotional interview in a public broadcast live on TV. Clinton won that primary by 2% of the vote, contrary to the predictions of pollsters who consistently had her trailing Obama for a few days up to the primary date. Clinton's win was the first time a woman had ever won a major American party's presidential primary for the purposes of delegate selection.

On January 30, 2008, after placing in third in the New Hampshire and South Carolina primaries, Edwards announced that he was suspending his campaign for the presidency, but he did not initially endorse any remaining candidates.

Super Tuesday
Super Tuesday was February 5, 2008, when the largest-ever number of simultaneous state primary elections was held. Super Tuesday ended up leaving the Democrats in a virtual tie, with Obama amassing 847 delegates to Clinton's 834 from the 23 states that held Democratic primaries.

California was one of the Super Tuesday states that could provide a large number of delegates to the candidates. Obama trailed in the California polling by an average of 6.0% before the primary; he ended up losing that state by 8.3% of the vote. Some analysts cited a large Latino turnout that voted for Clinton as the deciding factor.

The Louisiana, Nebraska, Hawaii, Wisconsin, U.S. Virgin Islands, the District of Columbia, Maryland, and Virginia primaries and the Washington and Maine caucuses all took place after Super Tuesday in February. Obama won all of them, giving him 10 consecutive victories after Super Tuesday.

Ohio, Texas, and Pennsylvania
On March 4, Hillary Clinton carried Ohio and Rhode Island in the Democratic primaries; some considered these wins, especially Ohio, a "surprise upset" by 10%, although she did lead in the polling averages in both states. She also carried the primary in Texas, but Obama won the Texas caucuses held the same day and netted more delegates from the state than Clinton.

Only one state held a primary in April. This was Pennsylvania, on April 22. Although Obama made a strong effort to win Pennsylvania, Hillary Clinton won that primary by nearly 10%, with approximately 55% of the vote. Obama had outspent Clinton three to one in Pennsylvania, but his comment at a San Francisco fundraiser that small-town Americans "cling" to guns and religion drew sharp criticism from the Clinton campaign and may have hurt his chances in the Keystone State. In addition, Clinton had several advantages in Pennsylvania. Throughout the primary process, she relied on the support of older, white, working class voters. Pennsylvania held a closed primary, which means that only registered Democrats could vote, and, according to Ron Elving of NPR, the established Democratic electorate "was older, whiter, more Catholic and more working-class than in most of the primaries to date." After Pennsylvania, Obama had a higher number of delegates and popular votes than Clinton did and was still in a stronger position to win the nomination. Clinton, however, had received the endorsement of more superdelegates than Obama.

Indiana and North Carolina
On May 6, North Carolina and Indiana held their Democratic presidential primaries. Clinton and Obama campaigned aggressively there before the voting took place. Polling had shown Obama a few points ahead in North Carolina and Clinton similarly leading in Indiana. In the actual results, Obama outperformed the polls by several points in both states, winning by a significant margin in North Carolina and losing by only 1.1% in Indiana (50.56% to 49.44%). After these primaries, most pundits declared that it had become "increasingly improbable," if not impossible, for Clinton to win the nomination. The small win in Indiana barely kept her campaign alive for the next month. Although she did manage to win the majority of the remaining primaries and delegates, it was not enough to overcome Obama's substantial delegate lead.

Florida and Michigan
During late 2007, the two parties adopted rules against states' moving their primaries to an earlier date in the year. For the Republicans, the penalty for this violation was supposed to be the loss of half the state party's delegates to the convention. The Democratic penalty was the complete exclusion from the national convention of delegates from states that broke these rules. The Democratic Party allowed only four states to hold elections before February 5, 2008. Clinton won a majority of delegates and popular votes from both states (though 40% voted uncommitted in Michigan) and subsequently led a fight to seat all the Florida and Michigan delegates.

There was some speculation that the fight over the delegates could last until the convention in August. On May 31, 2008, the Rules and Bylaws Committee of the Democratic Party reached a compromise on the Florida and Michigan delegate situation. The committee decided to seat delegates from Michigan and Florida at the convention in August, but to only award each a half-vote.

Clinching the nomination
The major political party nomination process (technically) continues through June of an election year. In previous cycles, the candidates were effectively chosen by the end of the primaries held in March, but, in this cycle, Barack Obama did not win enough delegates to secure the nomination until June 3, after a 17-month campaign against Hillary Clinton. He had a wide lead in states won, while Clinton had won majorities in several of the larger states. Now, because a form of proportional representation and popular vote decided Democratic state delegate contests, numbers were close between Clinton and Obama. By May, Clinton claimed to hold a lead in the popular vote, but the Associated Press found that her numbers were "accurate only" in one close scenario.

In June, after the last of the primaries had taken place, Obama secured the Democratic nomination for president, with the help of multiple super delegate endorsements (most of the super delegates had refused to declare their support for either candidate until the primaries were completed). He was the first African American to win the nomination of a major political party in the United States. For several days, Clinton refused to concede the race, although she signaled her presidential campaign was ending in a post-primary speech on June 3 in her home state of New York. She finally conceded the nomination to Obama on June 7. She pledged her full support to the presumptive nominee and vowed to do everything she could to help him get elected.

Republican Party nomination
Not only was the 2008 election the first time since 1952 that neither the incumbent president nor the incumbent vice president was a candidate in the general election, but it was also the first time since the 1928 election that neither sought his party's nomination for president; as Bush was term-limited from seeking another nomination, the unique aspect was Vice President Cheney's decision not to seek the Republican nomination. The 2008 election was also the third presidential election since 1896 in which neither the incumbent president, the incumbent vice president, nor a current or former member of the incumbent president's Cabinet won the nomination of either major party the others being 1920 and 1952. With no members of the Bush administration emerging as major contenders for the Republican nomination, the Republican race was as open as the Democratic race.

Before the primaries
Immediately after the 2006 midterm elections, media pundits began speculating, as they did about the Democrats, about potential Republican candidates for president in 2008. In November 2006, former New York City Mayor Rudolph Giuliani led in the polls, followed closely by Arizona Senator John McCain. The media speculated that Giuliani's pro-choice stance on abortion and McCain's age and support of the unpopular Iraq War would be detriments to their candidacies. Giuliani remained the frontrunner in the polls throughout most of 2007, with McCain and former Tennessee Senator Fred Thompson fighting for second place. Arkansas Governor Mike Huckabee, Giuliani, former Massachusetts governor Mitt Romney, and Texas Representative Ron Paul announced their candidacies on January 28, February 5, February 13, and March 12, respectively. McCain officially announced his candidacy on March 1, 2007, after several informal announcements. In the third quarter of 2007, the top four GOP (Republican) fundraisers were Romney, Giuliani, Thompson, and Ron Paul. MSNBC's Chuck Todd christened Giuliani and John McCain the front runners after the second Republican presidential debate in early 2007.

Early primaries/caucuses
Huckabee, winner of Iowa, had little to no money and hoped for at least a third-place finish in New Hampshire. McCain eventually displaced Rudy Giuliani and Romney as the front runner in New Hampshire. McCain staged a turnaround victory, having been written off by the pundits and polling in single digits less than a month before the race.

With the Republicans stripping Michigan and Florida of half their delegates for moving their primaries into January 2008 against party rules, the race for the nomination was based there. McCain meanwhile managed a small victory over Huckabee in South Carolina, setting him up for a larger and more important victory over Romney in Florida, which held a closed primary on January 29. By this time, after several scandals, no success in the early primaries, and a third-place finish in Florida, Giuliani conceded the nomination and endorsed John McCain the next day.

Super Tuesday
McCain was also endorsed in February by California Governor Arnold Schwarzenegger before the California primary took place on Super Tuesday. This gave him a significant boost in the polls for the state's primary, which awarded the greatest number of delegates of all the states. On Super Tuesday, McCain won his home state of Arizona, taking all 53 delegates. He also won nearly all of California's 173 delegates, the largest of the Super Tuesday prizes. McCain also scored wins in seven other states, picking up 574 delegates. Huckabee was the "surprise performer", winning 5 states and 218 delegates. Romney won 7 states and 231 delegates. Two days later, Romney suspended his presidential campaign, saying that if he stayed in the race, he would "forestall the launch of a national campaign and be making it easier for Senator Clinton or Obama to win". His departure left Huckabee and Paul as McCain's only major challengers in the remaining primaries and caucuses. Romney endorsed McCain on February 14.

Louisiana, the District of Columbia, Kansas, Wisconsin, and Washington held primaries in February after Super Tuesday. Despite McCain picking up big victories, Huckabee won Louisiana and Kansas. McCain narrowly carried the Washington caucuses over Huckabee and Paul, who amassed a large showing. The Virgin Islands and Puerto Rico closed February for the Republicans. After Super Tuesday, John McCain had become the clear front runner, but by the end of February, he still had not acquired enough delegates to secure the nomination. In March, John McCain clinched the Republican nomination after sweeping all four primaries, Texas, Ohio, Vermont, and Rhode Island, putting him over the top of the 1,191 delegates required to win the GOP nomination. Mike Huckabee then conceded the race to McCain, leaving Ron Paul, who had just 16 delegates, as his only remaining opponent. Romney would eventually become the Republican presidential nominee 4 years later, which he then lost to Barack Obama.

Third party and other nominations
Along with the Democratic and Republican parties, three other parties nominated candidates with ballot access in enough states to win the minimum 270 electoral votes needed to win the election. These were the Constitution Party, the Green Party, and the Libertarian Party. In addition, independent candidate Ralph Nader ran his own campaign.

The Constitution Party nominated writer, pastor, and conservative talk show host Chuck Baldwin for president, and attorney Darrell Castle from Tennessee for vice president. While campaigning, Baldwin voiced his opposition to the Iraq War, the Sixteenth Amendment, Roe v. Wade, the IRS, and the Federal Reserve.

The Green Party nominated former Democratic representative Cynthia McKinney from Georgia for president, and political activist Rosa Clemente from New York for vice president. McKinney campaigned on a platform that supported single-payer universal health care, the withdrawal of American troops from Iraq and Afghanistan, reparations for African Americans, and the creation of a Department of Peace.

The Libertarian Party nominated former Republican representative Bob Barr from Georgia for president, and his former rival for the Libertarian nomination Wayne Allyn Root from Nevada, for vice president. During the 2008 presidential campaign, Barr advocated a reworking or abolition of the income tax and opposed the war in Iraq and the Patriot Act.

Party conventions

 * April 23–26, 2008: 2008 Constitution Party National Convention held in Kansas City, Missouri.
 * May 23–26, 2008: 2008 Libertarian National Convention, held in Denver, Colorado.
 * July 10–13, 2008: 2008 Green Party National Convention, held in Chicago, Illinois.
 * August 25–28, 2008: 2008 Democratic National Convention, held in Denver, Colorado.
 * September 1–4, 2008: 2008 Republican National Convention, held in Saint Paul, Minnesota.

Iraq
The unpopular war in Iraq was a key issue during the campaign before the economic crisis. John McCain supported the war while Barack Obama opposed it (Obama's early and strong opposition to the war helped him stand out against the other Democratic candidates during the primaries, as well as stand out to a war-weary electorate during the general campaign). Though McCain meant it as a peacetime presence like the United States maintained in Germany and Japan after World War II, his statement that the United States could be in Iraq for as much as the next 50 to 100 years would prove costly. Obama used it against him as part of his strategy to tie him to the unpopular President Bush.

John McCain's support for the troop 'surge' employed by General David Petraeus, which was one of several factors credited with improving the security situation in Iraq, may have boosted McCain's stance on the issue in voters' minds. McCain (who supported the invasion) argued that his support for the successful surge showed his superior judgment. However, Obama was quick to remind voters that there would have been no need for a "surge" had there been no war at all, thus questioning McCain's judgment.

Bush's unpopularity
George W. Bush had become increasingly unpopular among Americans by late 2005 due in part by the growing unpopularity of the Iraq War domestically and internationally, as well as Bush's handling of the financial crisis of 2007–2008 and Hurricane Katrina in 2005. By the time Obama was elected as President of the United States on November 4, 2008, Bush's approval rating was in the low to mid 20s and his disapproval grew increasingly significant, being in the high 60s, and even low 70s in some polls. Polls consistently showed that his approval ratings among American voters had averaged around 30 percent. In March 2008, Bush endorsed McCain at the White House, but did not make a single appearance for McCain during the campaign. Bush appeared at the 2008 GOP convention only through a live video broadcast. He chose not to appear in person due to disaster events in the Gulf of Mexico in the aftermath of Hurricane Gustav. Although he supported the war in Iraq, McCain made an effort to show that he had disagreed with Bush on many other key issues such as climate change. During the entire general election campaign, Obama countered by pointing out in ads and at numerous campaign rallies that McCain had claimed in an interview that he voted with Bush 90% of the time, and congressional voting records supported this for the years Bush was in office.

Age issue

Similar to Senator Bob Dole's 1996 presidential campaign, one of the more widely leveled charges against McCain was the issue of his age—he turned 72 in August and there was widespread concern about the idea of electing a man who would be 80 years old if he completed two full terms in office (the oldest president, Ronald Reagan, had been a month shy of 78 when he left office in January 1989). In addition, McCain suffered from the ill effects of his captivity in North Vietnam and reportedly had difficulty lifting his arms above his head. His age in particular was considered a liability against the youthful Senator Obama, who was the first Generation Xer to run for president on a major party ticket. McCain for comparison was born before World War II and belonged to the Silent Generation. Much like Bob Dole, McCain attempted to counter these charges by releasing all of his medical records, something Obama did not do. McCain's wife Cindy dismissed concerns about his health by arguing that "We went hiking the Grand Canyon last summer and [John] did great and had no trouble keeping up with us." McCain also appeared at several campaign stops with his still-active 95-year-old mother. In a speech on the House floor, Pennsylvania Congressman John Murtha criticized McCain's age by saying "Seven presidents have come and gone since I've been in Congress, and I saw the toll the job took on each one of them." If elected, McCain would have been the first president born in the 1930s. McCain ultimately died in 2018, just one year after the completion of Obama's second term.

Like the Clinton campaign in 1996, Obama avoided discussing McCain's age directly, instead preferring to simply call his ideas and message "old" and "old hat". He also made a strong appeal to youth voters and back during his primary contest with Hillary Clinton, had stated "When I watched the feud between the Clintons and [Newt Gingrich] unfold during the 1990s, I was reminded of old quarrels started on college campuses long ago. It's time for a new generation to take over." Obama's active use of a Blackberry and other modern technology also stood in contrast to the Arizona Senator's admission that he did not use a computer or a cell phone. McCain's service in Vietnam, while marketable to baby boomers, was referred to as "unimportant" to younger voters.

Obama promised "universal health care, full employment, a green America, and an America respected instead of feared by its enemies".

Polls regularly found the general electorate as a whole divided more evenly between 'change' and 'experience' as candidate qualities than the Democratic primary electorate, which split in favor of 'change' by a nearly 2–1 margin. Advantages for McCain and Obama on experience and the ability to bring change, respectively, remained steady through the November 4 election. However, final pre-election polling found that voters considered Obama's inexperience less of an impediment than McCain's association with sitting president George W. Bush, an association which was rhetorically framed by the Obama campaign throughout the election season as "more of the same".

McCain appeared to undercut his line of attack by picking first-term Alaska governor Sarah Palin to be his running mate. Palin had been governor only since 2006, and before that had been a council member and mayor of Wasilla. The choice of Palin was controversial; however, it appeared to solve two pressing concerns—McCain's age and health (since a youthful vice president would succeed him to office if he died or became incapacitated) and appealing to right-wing conservatives, a group that had been comparatively unmoved by McCain. Palin also came off as more down-to-earth and relatable to average Americans than McCain, widely criticized as a "Beltway insider". However, media interviews suggested that Palin lacked knowledge on certain key issues, and they cast doubt among many voters about her qualifications to be vice president or president. In this regard, her inexperience was also a liability when McCain's age and health were factored in—there was a higher-than-normal probability of Palin succeeding to the presidency. "One 72-year-old heartbeat away from the presidency" became a popular anti-GOP slogan. She also came under attack on everything from her 17-year-old daughter giving birth to a child out of wedlock to actively participating in hunting moose and other animals. Because of Palin's conservative views, there was also concern that she would alienate independents and moderates, two groups that pundits observed McCain would need to win the election.

Economy
Polls taken in the last few months of the presidential campaign and exit polls conducted on Election Day showed the economy as the top concern for voters. In the fall of 2008, many news sources were reporting that the economy was suffering its most serious downturn since the Great Depression. During this period, John McCain's election prospects fell with several politically costly comments about the economy.

On August 20, John McCain said in an interview with Politico that he was uncertain how many houses he and his wife, Cindy, owned; "I think—I'll have my staff get to you," he told the media outlet. Both on the stump and in Obama's political ad, "Seven", the gaffe was used to portray McCain as somebody unable to relate to the concerns of ordinary Americans. This out-of-touch image was further cultivated when, on September 15, the day of the Lehman Brothers bankruptcy, at a morning rally in Jacksonville, Florida, McCain declared that "the fundamentals of our economy are strong," despite what he described as "tremendous turmoil in our financial markets and Wall Street." With the perception among voters to the contrary, the comment appeared to cost McCain politically.

On September 24, 2008, after the onset of the 2008 global financial crisis, McCain announced that he was suspending his campaign to return to Washington so he could help craft a $700 billion bailout package for the troubled financial industry, and he stated that he would not debate Obama until Congress passed the bailout bill. Despite this decision, McCain was portrayed as somebody not playing a significant role in the negotiations for the first version of the bill, which fell short of passage in the House. He eventually decided to attend the first presidential debate on September 26, despite Congress' lack of immediate action on the bill. His ineffectiveness in the negotiations and his reversal in decision to attend the debates were seized upon to portray McCain as erratic in his response to the economy. Days later, a second version of the original bailout bill was passed by both the House and Senate, with Obama, his vice presidential running mate Joe Biden, and McCain all voting for the measure (Hillary Clinton would as well).

All the aforementioned remarks and campaign issues hurt McCain's standing with voters. All these also occurred after the onset of the economic crisis and after McCain's poll numbers had started to fall. Although sound bites of all of these "missteps" were played repeatedly on national television, many pundits and analysts say that the actual financial crisis and economic conditions caused McCain's large drop in support in mid-September and severely damaged his campaign.

Health care
John McCain's proposals focused on open-market competition rather than government funding or control. At the heart of his plan were tax credits – $2,500 for individuals and $5,000 for families who do not subscribe to or do not have access to health care through their employer. To help people who are denied coverage by insurance companies due to pre-existing conditions, McCain proposed working with states to create what he calls a "Guaranteed Access Plan".

Barack Obama called for universal health care. His health care plan proposed creating a National Health Insurance Exchange that would include both private insurance plans and a Medicare-like government run option. Coverage would be guaranteed regardless of health status, and premiums would not vary based on health status either. It would have required parents to cover their children, but did not require adults to buy insurance.

Critics of McCain's plan argued that it would not significantly reduce the number of uninsured Americans, would increase costs, reduce consumer protections and lead to less generous benefit packages. Critics of Obama's plan argued that it would increase federal regulation of private health insurance without addressing the underlying incentives behind rising health care spending. Mark Pauly suggested that a combination of the two approaches would work better than either one alone.

A poll released in early November 2008 found that voters supporting Obama listed health care as their second priority; voters supporting McCain listed it as fourth, tied with the war in Iraq. Affordability was the primary health care priority among both sets of voters. Obama voters were more likely than McCain voters to believe government can do much about health care costs.

Presidential debates
The United States presidential election of 2008 was sponsored by the Commission on Presidential Debates (CPD), a bipartisan organization that sponsored four debates that occurred at various locations around the United States (U.S.) in September and October 2008. Three of the debates involved the presidential nominees, and one involved the vice-presidential nominees.

Another debate was sponsored by the Columbia University political union and took place there on October 19. All candidates who could theoretically win the 270 electoral votes needed to win the election were invited, and Ralph Nader, Cynthia McKinney, and Chuck Baldwin agreed to attend. Amy Goodman, principal host of Democracy Now!, moderated. It was broadcast on cable by C-SPAN and on the Internet by Break-the-Matrix.

Campaign costs
The reported cost of campaigning for president has increased significantly in recent years. One source reported that if the costs for both Democratic and Republican campaigns were added together (for the presidential primary election, general election, and the political conventions), the costs have more than doubled in only eight years ($448.9 million in 1996, $649.5 million in 2000, and $1.01 billion in 2004). In January 2007, Federal Election Commission Chairman Michael E. Toner estimated that the 2008 race would be a $1 billion election, and that to be taken seriously, a candidate would have needed to raise at least $100 million by the end of 2007.

Expense summary
According to required campaign filings as reported by the Federal Election Commission (FEC), 148 candidates for all parties collectively raised $1,644,712,232 and spent $1,601,104,696 for the primary and general campaigns combined through November 24, 2008. The amounts raised and spent by the major candidates, according to the same source, were as follows:

Notable expressions and phrases

 * Drill, baby, drill: Republican self-described energy policy
 * Yes We Can: Obama's campaign slogan
 * That one: McCain's reference to Obama during the 2nd debate.
 * Lipstick on a pig: Obama used this phrase to insinuate that any changes that McCain was advocating from the policies of George W. Bush would only be slight modifications of Bush's policies but the underlying policies would be the same, and in Obama's opinion, bad. Some called it sexist, claiming it was a reference to Sarah Palin, who cracked a joke during the Republican convention that the only difference between a hockey mom and a pit bull is lipstick.

Fundraising
Howard Dean collected large contributions through the Internet in his 2004 primary run. In 2008, candidates went even further to reach out to Internet users through their own sites and such sites as YouTube, MySpace, and Facebook.

On December 16, 2007, Ron Paul collected $6 million, more money on a single day through Internet donations than any presidential candidate in US history.

Promotion
Not only did the Internet allow candidates to raise money, but also it gave them a tool to appeal to newer and younger demographics. Political pundits were now evaluating candidates based on their social media following. Senator Barack Obama's victory is credited to his competitive edge in social media and Internet following. Obama had over 2 million American supporters on Facebook and 100,000 followers on Twitter, while McCain attracted only 600,000 Facebook supporters (likes) and 4,600 followers on Twitter. Obama's YouTube channel held 115,000 subscribers and more than 97 million video views. Obama had maintained a similar advantage over Senator Hillary Clinton in the Democratic primary.

Obama's edge in social media was crucial to the election outcome. According to a study by the Pew Internet and American Life project, 35 percent of Americans relied on online video for election news. Ten percent of Americans used social networking sites to learn about the election. The 2008 election showed huge increases in Internet use.

Another study done after the election gave a lot of insight on young voters. Thirty-seven percent of Americans ages 18–24 got election news from social networking sites. Almost a quarter of Americans saw something about the election in an online video. YouTube and other online video outlets allowed candidates to advertise in ways like never before. The Republican Party in particular was criticized for not adequately using social media and other means to reach young voters.

Anonymous and semi-anonymous smear campaigns, traditionally done with fliers and push calling, also spread to the Internet. Organizations specializing in the production and distribution of viral material, such as Brave New Films, emerged; such organizations have been said to be having a growing influence on American politics.

Voter suppression allegations
Allegations of voter list purges using unlawful criteria caused controversy in at least six swing states: Colorado, Indiana, Ohio, Michigan, Nevada and North Carolina. On October 5, 2008, the Republican Lt. Governor of Montana, John Bohlinger, accused the Montana Republican Party of vote caging to purge 6,000 voters from three counties which trend Democratic. Allegations arose in Michigan that the Republican Party planned to challenge the eligibility of voters based on lists of foreclosed homes. The campaign of Democratic presidential nominee Barack Obama filed a lawsuit challenging this. The House Judiciary Committee wrote to the Department of Justice requesting an investigation.

Libertarian candidate Bob Barr filed a lawsuit in Texas to have Obama and McCain removed from the ballot in that state. His campaign alleged that both of the candidates had missed the August 26 deadline to file and had been included on the ballot in violation of Texas election law. Neither Obama nor McCain had been confirmed as the candidate of their respective parties at the time of the deadline. The Texas Supreme Court dismissed the lawsuit without explanation.

In Ohio, identified by both parties as a key state, allegations surfaced from both Republicans and Democrats that individuals from out of state were moving to the state temporarily and attempting to vote despite not meeting the state's requirement of permanent residency for more than 29 days. The Franklin County Board of Elections referred 55 cases of possible voting irregularities to the local prosecutor. Three groups attracted particular notice: 'Vote from Home,' 'Vote Today Ohio,' and 'Drop Everything and Come to Ohio.' Vote from Home attracted the most attention when thirteen of the group's members moved to the same location in eastern Columbus. Members of the group organized by Marc Gustafson, including several Marshall and Rhodes scholars studying at Oxford University, settled with Franklin County Prosecutor Ron O'Brien to have their challenged ballots withdrawn. The Obama campaign and others alleged that members of the McCain campaign had also voted without properly establishing residency. Since 1953, only six people in Ohio have gone to prison for illegal voting.

Media bias
Republicans and independents leveled significant criticism at media outlets' coverage of the presidential election season. An October 22, 2008 Pew Research Center poll estimated 70% of registered voters believed journalists wanted Barack Obama to win the election, as opposed to 9% for John McCain. Another Pew survey, conducted after the election, found that 67% of voters thought that the press fairly covered Obama, versus 30% who viewed the coverage as unfair. Regarding McCain, 53% of voters viewed his press coverage as fair versus 44% who characterized it as unfair. Among affiliated Democrats, 83% believed the press fairly covered Obama; just 22% of Republicans thought the press was fair to McCain.

At the February debate, Tim Russert of NBC News was criticized for what some perceived as disproportionately tough questioning of Democratic presidential contender Hillary Clinton. Among the questions, Russert had asked Clinton, but not Obama, to provide the name of the new Russian President (Dmitry Medvedev). This was later parodied on Saturday Night Live. In October 2007, liberal commentators accused Russert of harassing Clinton over the issue of supporting drivers' licenses for illegal immigrants.

On April 16, ABC News hosted a debate in Philadelphia, Pennsylvania. Moderators Charles Gibson and George Stephanopoulos were criticized by viewers, bloggers and media critics for the poor quality of their questions. Many viewers said they considered some of the questions irrelevant when measured against the importance of the faltering economy or the Iraq War. Included in that category were continued questions about Obama's former pastor, Senator Hillary Clinton's assertion that she had to duck sniper fire in Bosnia more than a decade ago, and Senator Obama's not wearing an American flag pin. The moderators focused on campaign gaffes and some believed they focused too much on Obama. Stephanopoulos defended their performance, saying "Senator Obama was the front-runner" and the questions were "not inappropriate or irrelevant at all."

In an op-ed published on April 27, 2008, in The New York Times, Elizabeth Edwards wrote that the media covered much more of "the rancor of the campaign" and "amount of money spent" than "the candidates' priorities, policies and principles." Author Erica Jong commented that "our press has become a sea of triviality, meanness and irrelevant chatter." A Gallup poll released on May 29, 2008, also estimated that more Americans felt the media was being harder on Hillary Clinton than they were towards Barack Obama. Time magazine columnist Mark Halperin stated that the media during the 2008 election had a "blind, almost slavish" worship of Obama.

The Project for Excellence in Journalism and Harvard University's Joan Shorenstein Center on the Press, Politics and Public Policy conducted a study of 5,374 media narratives and assertions about the presidential candidates from January 1 through March 9, 2008. The study found that Obama received 69% favorable coverage and Clinton received 67%, compared to only 43% favorable media coverage of McCain. Another study by the Center for Media and Public Affairs at George Mason University found the media coverage of Obama to be 72% negative from June 8 to July 21 compared to 57% negative for McCain. An October 29 study found 29% of stories about Obama to be negative, compared to 57% of stories about McCain being negative.

Conduct

Election Day was on November 4, 2008. The majority of states allowed early voting, with all states allowing some form of absentee voting. Voters cast votes for listed presidential candidates but were actually selecting representatives for their state's Electoral College slate.

A McCain victory quickly became improbable as Obama amassed early wins in his home state of Illinois, the Northeast, and the critical battleground states of Ohio (which no Republican has ever been elected president without winning) and Pennsylvania by 9:30 pm Eastern Standard Time. Obama won the entire Northeast by comfortable margins and the Great Lakes states of Michigan, Wisconsin, and Minnesota by double digits. McCain held on to traditionally Republican states like North Dakota, South Dakota, Nebraska (though notably, Obama did win an electoral vote from Nebraska's 2nd congressional district), Kansas, Oklahoma, Montana, Utah, Idaho, Wyoming, and his home state of Arizona. Out of the southern states, Obama won Florida, North Carolina, Delaware, Maryland, and Virginia. Obama also won the hotly contested states of Iowa and New Mexico, which Al Gore had won in 2000 and George W. Bush in 2004. Also, for only the second time since 1936 (1964 being the other), Indiana went Democratic, giving Obama all eight Great Lakes states, the first time a presidential candidate had won all of them since Richard Nixon in 1972.

CNN and Fox News called Virginia for Obama shortly before 11:00 pm, leaving him only 50 electoral votes shy of victory with only six West Coast states (California, Oregon, Washington, Idaho, Alaska, and Hawaii) still voting. All American networks called the election in favor of Obama at 11:00 pm as the polls closed on the West Coast. Obama was immediately declared the winner in California, Oregon, Washington, and Hawaii, McCain won Idaho, and the Electoral College totals were updated to 297 for Obama and 146 for McCain (270 are needed to win). McCain gave a concession speech half an hour later in his hometown of Phoenix, Arizona. Obama appeared just before midnight Eastern Time in Grant Park, Chicago, in front of a crowd of 250,000 people to deliver his victory speech. Following Obama's speech, spontaneous street parties broke out in cities across the United States including Philadelphia, Houston, Las Vegas, Miami, Chicago, Columbus, Detroit, Boston, Los Angeles, Portland, Washington, D.C., San Francisco, Denver, Atlanta, Madison, and New York City and around the world in London; Bonn; Berlin; Obama, Japan; Toronto; Rio de Janeiro; Sydney; and Nairobi.

Later on election night, after Obama was named the winner, he picked up several more wins in swing states in which the polls had shown a close race. These included Florida, Indiana, Virginia, and the western states of Colorado and Nevada. All of these states had been carried by Bush in 2004. North Carolina and the bellwether state of Missouri remained undecided for several days. Eventually Obama was declared the winner in North Carolina and McCain in Missouri, with Obama pulling out a rare win in Nebraska's 2nd congressional district. This put the projected electoral vote count at 365 for Obama and 173 for McCain. Obama's victories in the populous swing states of Florida, Ohio, Pennsylvania, North Carolina, and Virginia contributed to his decisive win. The presidential electors cast their ballots for president and vice president, and Congress tallied these votes on January 8, 2009.

Turnout
The voter turnout for this election was broadly predicted to be high by American standards, and a record number of votes were cast. The final tally of total votes counted was 131.3 million, compared to 122.3 million in 2004 (which also boasted the highest record since 1968, the last presidential election before the voting age was lowered to 18). Expressed as a percentage of eligible voters, 131.2 million votes could reflect a turnout as high as 63.0% of eligible voters, which would be the highest since 1960. This 63.0% turnout rate is based on an estimated eligible voter population of 208,323,000. Another estimate puts the eligible voter population at 213,313,508, resulting in a turnout rate of 61.6%, which would be the highest turnout rate since 1968.

Broken down by age group, voters under 35 voted for Obama by a large majority with McCain most popular among voters over 60. Voters between 35 and 59 were nearly split 50/50 between the two candidates.

American University's Center for the Study of the American Electorate released a report on November 6, 2008, two days after the election, which concluded that the anticipated increase in turnout had failed to materialize. That report was the basis for some news articles that indicated voter turnout failed to meet expectations. When the remaining votes were counted after the release of the report, the total number of votes cast in the presidential election was raised to 131.2 million, which surpassed the American University report's preliminary estimate of 126.5 to 128.5 million voters by a factor of between 2% and 4%.

The election saw increased participation from African Americans, who made up 13.0% of the electorate, versus 11.1% in 2004. According to exit polls, over 95% of African Americans voted for Obama. This played a critical role in Southern states such as North Carolina. 74% of North Carolina's registered African American voters turned out, as opposed to 69% of North Carolinians in general, with Obama carrying 100% (with rounding) of African-American females and African Americans age 18 to 29, according to exit polling. This was also the case in Virginia, where much higher turnout among African Americans propelled Obama to victory in the former Republican stronghold. Even in southern states in which Obama was unsuccessful, such as Georgia and Mississippi, due to large African American turnout he was much more competitive than John Kerry in 2004.

Ballot access
No other candidate had ballot access in enough states to win 270 electoral votes. All six candidates appeared on the ballot for a majority of the voters, while the 17 other listed candidates were available to no more than 30% of the voters.

The following candidates and parties had ballot listing or write-in status in more than one state:
 * Alan Keyes (America's Independent Party) received 47,746 votes; listed in three states: Colorado and Florida, plus California (listed as American Independent), and also had write-in status in Kentucky, Ohio, Texas, and Utah.
 * Ron Paul received 42,426 votes; listed in Louisiana (Louisiana Taxpayers) and in Montana (Constitution), with write-in status in California.
 * Gloria La Riva (Party for Socialism and Liberation) received 6,808 votes nationally; listed in 12 states: Arkansas, Colorado, Florida, Iowa, Louisiana, New Jersey, New York, Rhode Island, Utah, Vermont, Washington, and Wisconsin.
 * Brian Moore (Socialist Party, see Brian Moore presidential campaign, 2008) received 6,538 votes; listed in eight states: Colorado, Florida, Iowa, New Jersey, Ohio, and Wisconsin, and Tennessee (independent) and Vermont (Liberty Union). He also filed for write-in status in 17 other states: Alaska, Connecticut, Illinois, Indiana, Kansas, Kentucky, Michigan, Minnesota, Montana, New York, North Carolina, Oregon, Texas, Utah, Virginia, Washington, and Wyoming.
 * Róger Calero (Socialist Workers Party) received 5,151 votes; listed in ten states. He was listed by name in Delaware, Minnesota, New Jersey, New York, and Vermont. James Harris was listed as his stand-in in Colorado, Florida, Iowa, Louisiana, and Washington, and also had write-in status in California.
 * Charles Jay (Boston Tea Party) received 2,422 votes; listed in Colorado and Florida, and in Tennessee (as independent), with write-in status in Arizona, Montana, and Utah.
 * Tom Stevens (Objectivist) received 755 votes; listed in Colorado and Florida.
 * Gene Amondson (Prohibition) received 653 votes; listed in Colorado, Florida, and Louisiana.
 * Jonathan Allen (Heartquake) received 483 votes; listed only in Colorado, with write-in status in Arizona, Georgia, Montana, Texas, and other states.

The following candidates (parties) were listed on the ballot in only one state:
 * Richard Duncan (Independent) – Ohio; 3,905 votes.
 * John Joseph Polachek (New Party) Illinois; 1,149 votes.
 * Frank McEnulty (New American Independent) – Colorado (listed as unaffiliated); 829 votes.
 * Jeffrey Wamboldt (We the People) – Wisconsin; 764 votes.
 * Jeff Boss (Vote Here) – New Jersey; 639 votes.
 * George Phillies – New Hampshire (also listed with the label Libertarian); 531 votes.
 * Ted Weill (Reform) – Mississippi; 481 votes.
 * Bradford Lyttle (U.S. Pacifist) – Colorado; 110 votes.

In Nevada, 6,267 votes were cast for "None of These Candidates". In the three states that officially keep track of "blank" votes for president, 103,193 votes were recorded as "blank". More than 100,000 write-in votes were cast and recorded for a scattering of other candidates, including 62 votes for "Santa Claus" (in ten states) and 11 votes for "Mickey Mouse" (in five states).

According to the Federal Election Commission, an unusually high number of "miscellaneous" write-ins were cast for president in 2008, including 112,597 tallied in the 17 states that record votes for non-listed candidates. There were more presidential candidates on the ballot than at any other time in U. S. history, except for the 1992 election, which also had 23 candidates listed in at least one state.

Results
Of the 3,154 counties/districts/independent cities making returns, McCain won the most popular votes in 2,270 (71.97%) while Obama carried 884 (28.03%).

Popular vote totals are from the official Federal Election Commission report. The results of the electoral vote were certified by Congress on January 8, 2009.

Results by state
The following table records the official vote tallies for each state for those presidential candidates who were listed on ballots in enough states to have a theoretical chance for a majority in the Electoral College. State popular vote results are from the official Federal Election Commission report. The column labeled "Margin" shows Obama's margin of victory over McCain (the margin is negative for states and districts won by McCain).

Note: Maine and Nebraska each allow for their electoral votes to be split between candidates. In both states, two electoral votes are awarded to the winner of the statewide race and one electoral vote is awarded to the winner of each congressional district.

States and EV districts that flipped from Republican to Democratic

 * Colorado
 * Florida
 * Indiana
 * Iowa
 * Nebraska's 2nd congressional district
 * Nevada
 * New Mexico
 * North Carolina
 * Ohio
 * Virginia

Close states

States where the margin of victory was under 1% (26 electoral votes; 15 won by Obama, 11 by McCain):
 * 1)  Missouri, 0.13% (3,903 votes) – 11 electoral votes
 * 2)  North Carolina, 0.31% (14,177 votes) – 15 electoral votes

States where the margin of victory was between 1% and 5% (62 electoral votes; 59 won by Obama, 3 by McCain):
 * 1)  Indiana, 1.03% (28,391 votes) – 11 electoral votes
 * 2)  Nebraska's 2nd congressional district, 1.21% (3,370 votes) – 1 electoral vote
 * 3)  Montana, 2.26% (11,096 votes) – 3 electoral votes
 * 4)  Florida, 2.82% (236,450 votes) – 27 electoral votes
 * 5)  Ohio, 4.59% (262,224 votes) – 20 electoral votes

States/districts where the margin of victory was between 5% and 10% (73 electoral votes; 33 won by Obama, 40 by McCain):
 * 1)  Georgia, 5.21% (204,636 votes) – 15 electoral votes
 * 2)  Virginia, 6.30% (234,527 votes) – 13 electoral votes
 * 3)  South Dakota, 8.41% (32,130 votes) – 3 electoral votes
 * 4)  Arizona, 8.52% (195,404 votes) – 10 electoral votes
 * 5)  North Dakota, 8.63% (27,323 votes) – 3 electoral votes
 * 6)  Colorado, 8.95% (215,004 votes) – 9 electoral votes  (tipping-point state)
 * 7)  South Carolina, 8.98% (172,447 votes) – 8 electoral votes
 * 8)  Iowa, 9.53% (146,561 votes) – 7 electoral votes
 * 9)  New Hampshire, 9.61% (68,292 votes) – 4 electoral votes
 * 10)  Nebraska's 1st congressional district, 9.77% (26,768 votes) – 1 electoral vote

Blue denotes states or congressional districts won by Democrat Barack Obama; red denotes those won by Republican John McCain.

Statistics
Counties with highest percentage of Democratic vote:
 * 1) Washington, D.C. 92.46%
 * 2) Prince George's County, Maryland 88.87%
 * 3) Bronx County, New York 88.71%
 * 4) Shannon County, South Dakota 88.69%
 * 5) Petersburg, Virginia 88.64%

Counties with highest percentage of Republican vote:
 * 1) King County, Texas 92.64%
 * 2) Roberts County, Texas 92.08%
 * 3) Ochiltree County, Texas 91.70%
 * 4) Glasscock County, Texas 90.13%
 * 5) Beaver County, Oklahoma 89.25%

Voter demographics
Source: Exit polls conducted by Edison Research of Somerville, New Jersey, for the National Election Pool, a consortium of ABC News, Associated Press, CBS News, CNN, Fox News, and NBC News.

Analysis
Obama, having a white mother and Kenyan father of the Luo ethnic group, became the first African American as well as the first biracial president. Several black people had previously run for president, including Shirley Chisholm, Jesse Jackson, Lenora Fulani, Carol Moseley Braun, Alan Keyes, and Al Sharpton, though Obama was the first one even to win the nomination of a major party, let alone the general election. The Obama-Biden ticket was also the first winning ticket in American history in which neither candidate was a white Protestant, as Biden is Roman Catholic and the first Roman Catholic to be elected vice president; all previous tickets with Catholic vice presidential candidates had been defeated (1964, 1972, 1984). The Obama-Biden ticket was the first winning ticket consisting of two sitting senators since 1960 (John F. Kennedy/Lyndon B. Johnson) (in the previous election cycle (2004) Democrats also nominated two sitting senators, John Kerry of Massachusetts and John Edwards of North Carolina, but they lost to incumbents Bush and Cheney), and Obama became the first Northern Democratic president since Kennedy. Also, Obama became the first Democratic candidate to win a majority of the popular vote since Jimmy Carter in 1976, the first to win a majority of both votes and states since Lyndon Johnson in 1964, and the first Northern Democrat to win a majority of both votes and states since Franklin Roosevelt in 1944. Obama became the first Northern Democrat to win any state in the former Confederacy since Hubert Humphrey won Texas in 1968. This was the first presidential election since 1952 in which neither of the major-party nominees was the incumbent president or vice-president.

Prior to the election, commentators discussed whether Senator Obama would be able to redraw the electoral map by winning states that had been voting for Republican candidates in recent decades. In many ways, he was successful. He won every region of the country by double digits except the South, which John McCain won by nine percent, although Obama nonetheless carried Delaware, the District of Columbia, Maryland, North Carolina, Florida, and Virginia (as defined by the US Census Bureau). McCain won every state in the Deep South, where white voters had generally supported Republican candidates by increasingly large margins in the previous few decades. Obama won all of the 2004 swing states (states that either Kerry or Bush won by less than 5%) by a margin of 8.5 percent or more except for Ohio, which he carried by 4.5 percent.

Obama also defied political bellwethers, becoming the first person to win the presidency while losing Missouri since 1956 and while losing Kentucky and Tennessee since 1960. He was the first Democrat to ever win the presidency without carrying Missouri, to win without carrying Arkansas since that state joined the Union in 1836, and the first to win without West Virginia since 1916 (and, because one West Virginia elector had voted Democratic in 1916, Obama became the first Democrat to win the White House without any of the state's electors since its founding in 1863). Indiana and Virginia voted for the Democratic nominee for the first time since 1964, as did a solitary electoral vote from Nebraska's 2nd congressional district. Indiana would return to being a reliably red state in subsequent elections; Virginia, however, has been won by Democrats in every presidential election since and would grow increasingly Democratic at the state level. North Carolina, which Obama was the first Democrat to carry since 1976, would return to the Republican column in the following elections, though only by narrow margins each time.

Obama was also relatively competitive in some traditionally Republican states he lost, notably Montana, which he lost by under 3%, and Georgia, which he lost by just 5%. He is also the only 21st-century Democrat to lose North Dakota and South Dakota by just single digits.

This was the first presidential election in which Nebraska split its electoral votes between two candidates. Together with Maine, which would not split its votes until 2016, Nebraska is one of two states that allow a split in electoral votes without faithless electors: a candidate receives one electoral vote for each congressional district won (Nebraska has three, Maine two), while the statewide winner receives an additional two electoral votes. Obama won the electoral vote from Nebraska's 2nd congressional district, largely comprising the city of Omaha. Nebraska's other four electoral votes went to John McCain. This would not happen again until 2020.

, this election is the last time that Indiana or North Carolina voted Democratic, and is also the most recent election where one of the nominees has since died. Until 2024 this was also the most recent election in which any of the major presidential nominees had any military experience.

This election exhibited the continuation of some of the polarization trends evident in the 2000 and 2004 elections. McCain won whites 55–43 percent, while Obama won blacks 95–4 percent, Hispanics 67–31 percent, and Asians 62–35 percent. Voters aged 18–29 voted for Obama by 66–32 percent while elderly voters backed McCain 53–45 percent. The 25-year age gap between McCain and Obama was the widest in U.S. presidential election history among the top two candidates.

Opinion polling

 * Nationwide opinion polling for the 2008 United States presidential election
 * Statewide opinion polling for the 2008 United States presidential election
 * International opinion polling for the 2008 United States presidential election
 * Scientific forecasts: FiveThirtyEight

Voters

 * Abramson, Paul R., John H. Aldrich, and David W. Rohde. Change and Continuity in the 2008 Elections (2009) excerpt and text search
 * Corwin E. Smidt and others. The Disappearing God Gap? Religion in the 2008 Presidential Election (Oxford University Press; 2010) 278 pages. Finds that the gap between church-attending traditionalists and other voters is not closing, as has been claimed, but is changing in significant ways; draws on survey data from voters who were interviewed in the spring of 2008 and then again after the election.
 * Crespino, Joseph. "The U.S. South and the 2008 Election," Southern Spaces (2008) online
 * Jessee, Stephen A. "Voter Ideology and Candidate Positioning in the 2008 Presidential Election," American Politics Research, March 2010, Vol. 38 Issue 2, pp 195–210
 * Kenski, Kate, Bruce W. Hardy, and Kathleen Hall Jamieson. The Obama Victory: How Media, Money, and Message Shaped the 2008 Election (Oxford University Press; 2010) 378 pages. Draws on interviews with key campaign advisors as well as the National Annenberg Election Survey. excerpt and text search
 * Sabato, Larry. The Year of Obama: How Barack Obama Won the White House (2009)
 * Stempel III, Guido H. and Thomas K. Hargrove, eds. The 21st-Century Voter: Who Votes, How They Vote, and Why They Vote (2 vol. 2015).
 * Todd, Chuck, and Sheldon Gawiser. How Barack Obama Won: A State-by-State Guide to the Historic 2008 Presidential Election (2009) excerpt and text search


text:
Talk:R. Daneel Olivaw

Just to let anyone who is listening know
Just to let anyone who is listening know - I just posted a link to this in a comment on slashdot, so this page will probably get a half dozen edits in the next couple hours. --Raul654 13:33, 18 Dec 2003 (UTC)

Also Known As...
I'm not sure it's a good idea to have Daneel's alter ego names listed in the opening paragraph of the article -- wouldn't those constitute spoilers, since it's supposed to be the big surprise in Prelude to Foundation that Demerzel and Hummin are one and the same, and he's actually Daneel? I'm going to remove the parenthetical "also known as" from the opening sentence, since the alter ego names are listed in bold later in the article (below the spoiler notice). -- Dan Carlson 13:15, Jun 10, 2004 (UTC)
 * Dan - yes, I'm inclined to agree. →Raul654 15:11, Jun 10, 2004 (UTC)

Same problem with redirection

I don't know if this is the right place to note this, but I think there's another (major) spoiler due to the fact both Chetter Hummin and Eto Demerzel pages link to Daneel's one. Even though linking those pages is a good idea, is there any (reasonable) way to prevent users being redirected without any spoiler warning? →ale_bahgat 12:10, Nov 2, 2005 (UTC)

 * I thought so, too, and then I read Talk:Eto_Demerzel. -- Perfecto [[Image:Flag_of_Canada.svg|25px|Canada]] 01:58, 3 November 2005 (UTC)

Giskard invented the Zeroth Law, did he not?
I changed this line:

 * Daneel invents the Zeroth Law of Robotics after both robots come to see the incompleteness of the existing Laws of Robotics.

To read:

 * Giskard invents the Zeroth Law of Robotics after both robots come to see the incompleteness of the existing Laws of Robotics.

From Prelude to Foundation:

 * (Daneel speaking to Seldon):

 * ''But I had a . . . friend twenty thousand years ago. It seemed to him that there should be a still more general rule than any of the Three Laws. He called it the Zeroth Law, since zero comes before one.

 * The robot who first advanced the Zeroth Law died--became permanently inactive--because he was forced into an action that he felt would save humanity, yet which he could not be sure would save humanity.

This indicates, to me, that Daneel cannot have been the inventor of the Zeroth law. If anyone has better information, please correct me.

[[User:Shred|Shred -§-]] 01:51, 15 Sep 2004 (UTC)

Daneel invented the Zeroth Law
I have here Robots and Empire. It's the spanish translation, but it's a good one (Plaza & Janés Editorial). I roughly translate (chapter 63):

 * (Daneel to Vasilia)

 * There is a law that is supperior to the first law. «A robot cannot hurt the human race or, through inaction, allow that the human race being to come to harm.» I consider it now the Zeroth law of Robotics. The first law should say: «A robot may not harm a human being, or, through inaction, allow a human being to come to harm, except where such action would conflict with the Zeroth Law.»

It was Daneel the one who invents the Zeroth law. I suppose Daneel says later that Giskard invented the Zeroth law because it was through their mutual discussion that he was able to state it. Further, if I recall correctly, it was Giskard the one that mentions that something is incomplete in the Three Laws of Robotics, but it was Daneel the one that invented the Zeroth law.

So, I change the line to the original form.

--Canek 22:05, 15 Jan 2005 (UTC)

 * This is correct. Daneel invented it.--Againme (talk) 16:48, 26 July 2009 (UTC)

 * Except that it's not. Giskard was only able to do what he did because he extrapolated the Zeroth Law for himself and used it to override the First Law. Daneel was only the first to give it a proper wording and perhaps apply it better to himself (not shutting down even with the uncertainty of his plan, even psychohistory wasn't a really that accurate). 193.226.105.89 (talk) 12:05, 26 July 2010 (UTC)

This is going to sound horribly petty but.... in the article introduction it says Daneel was contructed to be impossible to disinguish from humans "like many robots of the period."

If memory serves, Daneel was one of a kind at the time (other than Jander). In fact, a lot of "Robots of Dawn" revolved around Falstofe's rival trying to get the secrets of humaniform construction. Even during the time of "Robots and Empire" humaniform robots were quite rare, at least in deployment.

My point is, Daneel was very much *unlike* the robots of his period, him being a humaniform. Should the introduction be changed?

No definition is given for the "period" that is encompassed by that statement. While Daneel was the first, and unique at the time, it seems well established that others were constructed in fairly short order, with varying degrees of perfection in their emulation of humans. —Preceding unsigned comment added by 208.34.40.3 (talk) 18:10, 13 January 2010 (UTC)

Violation of the Three Laws
Was or did "Hummin" violate the three laws of robotics? He was seen "protecting" Hari Seldon at the begining of Prelude to Foundation, wasn't he?? - Plau 15:16, 19 April 2006 (UTC)

 * It is possible that the thugs were humaniform robots themselves, sent there by Hummin/Demerzel. Or, maybe Daneel was able to weigh the options of protecting the future inventor of psychohistory vs. injuring two thugs, and was capable of choosing the former (through Zeroth law).

 * I thought the fact that the thugs reacted strongly to a weak insult pointed out that Hummin was using his powers on the thugs. IMHO it makes more sense to think of it as action under the zeroth law. --Kjoonlee 16:08, 23 October 2006 (UTC)
 * Or maybe the thugs were humaniform robots.... --Kjoonlee 06:44, 1 December 2006 (UTC)

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What about further appearances in Asimovian fiction?
Having just concluded the Aurora trilogy, written by Mark W. Tiedemann, I am left to wonder why such appearances are not a part of this article. While R. Daneel is not ever named outright, it is made clear in the final pages of the third book in the trilogy, Aurora, that Ariel's assistant, Hofton, is in fact Daneel. Elements of his overarching work to guide humanity are also part of the resolution to the entire situation. —Preceding unsigned comment added by 208.34.40.3 (talk) 18:17, 13 January 2010 (UTC)

Why "Daneel" and why "Olivaw"?
I've read everything from "I, Robot" to "Foundation's Edge", among others in between, and I've never found an explanation behind Daneel's name. It would seem some etymological derivation of "Daniel Oliver". According to Wikipedia there was a British botanist and a congressman from New York, USA in the 19th century, both named "Daniel Oliver". Maybe Asimov was fascinated with one of them or these are familial names he is honoring in his books? Does anyone know? 99.22.228.93 (talk) 15:35, 17 May 2011 (UTC)

 * We have to look at 2 things:

 * Internal logic.
 * How the Good Doctor usually named characters.

 * Robot Daneel Olivaw is an Auroran Robot. We know that Specers gave up Terrestrial Names even before the events of Mother Earth (novelette) because they began to see themselves as superior to Earthlings.

 * The Good Doctor dealt with the problem of making names of people in the far future and of aliens both pronounceable and other-worldly by letting classical cultures of the first millennia BCE inspire his names. He would derive his names from Roman, Grecian, Hebrew, Egyptian, Mesopotamian, Persian, Indus, Indian, and Chinese names.

 * Olduvai Gorge is a site of early hominins and has a similar name. Robot Daneel Olivaw has a similar name and is the first of a new kind of Humaniform-robots Doctors Sarton and Fastolfe create.

 * Robot Daneel Olivaw has a name reminiscent of classical names. — Preceding unsigned comment added by 76.102.232.188 (talk) 02:22, 21 December 2011 (UTC)

 * What you wrote just might described some of the way Asimov went about creating names. But it does not explain the choice to specifically evolve "Daniel" and "Oliver".  "Olduvai" is an interesting mention; did you read about that influence some where or is it your own thinking?  — Preceding unsigned comment added by 99.22.228.93 (talk) 20:04, 20 April 2012 (UTC)

 * It's worth noting that Asimov was fond of wordplay. Being keen on crosswords and the like, it seems to me that "Robot Daneel Olivaw" looks very much like an anagram of *..something..*. The best I could come up with is "I, brave new load tool", which I suppose is vaguely plausible. Maybe someone else could have a go at cracking it?

Of course, it might be a complete red herring and mean nothing at all.... 82.3.148.90 (talk) 13:58, 20 April 2013 (UTC)

The best anagram I found for "Robot Daneel Olivaw" is "A Viable Wonder Tool". — Preceding unsigned comment added by 104.175.196.206 (talk) 21:33, 1 September 2020 (UTC)

I read elsewhere that there are some obvious anagrams in Asimov's series. What about Cleon/clone? Martindo (talk) 12:33, 30 October 2021 (UTC)

Origin
Although I thought I remembered Daneel being built on Earth, too, there is this bit in Foundation and Earth that I just read:

"Perfectly, sir. I was manufactured, and existed for a time - how brief a time it seems to me, now - on the Spacer world of Aurora." (Kindle location 5220)

Although a bit awkward, that seems to have Daneel saying that he was manufactured on Aurora, not Earth. Yamki (talk) 14:30, 14 June 2017 (UTC)

The Foundation Series
This section has existed for 3 years without a single source and seems almost totally to consist of WP:OR, some of it fairly uncontroversial, but some of it more dubious. My clearing of it was reverted. Please include cites immediately to avoid deletion. Ashmoo (talk) 10:27, 9 November 2017 (UTC)

Cerebroanalysis
Daneel didn't learn that in "Robots and the Empire", he had that capability in "The Caves of Steel". Someone please adjust the main article. — Preceding unsigned comment added by 93.204.73.99 (talk) 21:53, 13 December 2019 (UTC)

——

As explained to Bailey by Daneel in "The caves of steel" (when cerebroanalysis is mentioned in chapter 10 on being used for checking Commissioner Enderby's innocence in the murder committed in Spacetown), the analysis is "the interpretation of the electromagnetic fields of the living brain cells". One cannot emphasize enough the explanation (with a copyright of 1953) of Asimov: it is not only the prediction of Magnetic Resonance Imaging, demonstrated 20 years later by P. Lauterbur in Nature, 1973, but also of the (still much disputed) claims on the use of fMRI for detecting deceit. Quite a prediction in Asimov's bag! I added a brief phrase on that fact in the article's introduction, and corrected what Daneel obtains from such an analysis in the Character Biography section (e.g., does not "read thoughts" but the emotional status of brain activity). BbBrox (talk) 05:00, 17 November 2021 (UTC)

R. Daniel Olivaw
I read the entire Asmovseries a couple years ago and vaguely recall someone searches out R. Damsel and finds him ‘retired’ on the moon in caverns there, ingeniously hidden. I was fascinated and wanted to reread it, but alas, I can’t find it. HELP. Send to :dcmanning48@gmail.com. Thanks. 2603:7000:D100:B9F7:98DF:9FCD:8782:3ABA (talk) 19:50, 15 December 2021 (UTC)

Notability, major rewrite needed
This article is 99% WP:FANCRUFTy WP:ALLPLOT summary, with little indicating WP:GNG of the topic. It needs a major rewrite, perhaps even at WP:TNT level - we should focus on discussing the character's reception/significance, based on reliable sources by scholars of literature and sf. Encyclopedias should go beyond plot summaries. Piotr Konieczny aka Prokonsul Piotrus| reply here 11:13, 16 January 2022 (UTC)
 * Agree. I've added sources above. As this robot acts as the connective tissue between Asimov's Robot and Foundation series, and is the only character to appear in both, there's likely more sources to be found. Olivaw-Daneel (talk) 00:22, 18 January 2022 (UTC)

license: Creative Commons - Attribution Share-Alike - https://creativecommons.org/licenses/by-sa/4.0/

title: Talk:R. Daneel Olivaw


text:
Fauré (surname)

Fauré is an Occitan family name, a variant of Faure, although the latter is pronounced.

Notable people with the surname include:
 * Alain Fauré (1962–2018), French politician
 * Amédée Fauré or Victor-Amédée Faure (1801–1878), French painter
 * Andrée Fauré (1904–1985), French ceramist and designer, daughter of Camille Fauré
 * Antoine Fauré (1883–1954), French cyclist
 * Camille Fauré (1874–1956), French ceramicist
 * Cédric Fauré (born 1979), French football striker
 * Emmanuel Fauré-Fremiet (1883–1971), French biologist, son of Gabriel Fauré
 * Gabriel Fauré (1845–1924), French composer
 * Gérard Fauré (born 1946), French essayist, former drug dealer and bank robber
 * Maurice Fauré (1859–1945), French sports shooter
 * Nicolas Fauré (born 1984), French rugby league player
 * Sylvain Fauré (born 1978), Monegasque swimmer

title: Fauré (surname)


text: Cocksucker

title: Cocksucker


text: User talk:142.227.222.1

title: User talk:142.227.222.1


text:
Yuri Baturin

Yuri Mikhailovich Baturin (Юрий Михайлович Батурин; born 12 June 1949, in Moscow), is a Russian cosmonaut and former politician. He has the federal state civilian service rank of 1st class Active State Councillor of the Russian Federation.

Baturin graduated from the Moscow Institute of Physics and Technology in 1973, and is the former Assistant to the President on National Security and Secretaty of the Defense Council (1996-1998); he is also an author in constitutional law. Baturin was also a cosmonaut who flew on two missions.

His first spaceflight, sometimes called Mir EP-4, was launched with the spacecraft Soyuz TM-28 13 August 1998, and landed with Soyuz TM-27. He was a research cosmonaut for this mission, which lasted for 11 days 19 hours 39 minutes. His second spaceflight was ISS EP-1, which was launched with the spacecraft Soyuz TM-32 on April 28, 2001, and landed with Soyuz TM-31. This mission was notable as carrying to first paying space tourist Dennis Tito. For this mission he was designated a Flight Engineer; the mission lasted for 7 days 22 hours and 4 minutes.

He married Svetlana Veniaminovna Polubinskaya; they had a daughter.

title: Yuri Baturin


text:
Talk:Moore–Penrose inverse

Forced math notation / images
This article is using math image forcing in almost all places. What I mean is that e.g. $$A A^+A = A\,\!$$ is used instead of $$A A^+A = A$$; the former forces the use of png images for math by the \,\! construction.

I do not like this for several reasons:
 * 1) It is ugly (note how png images do a poor job respecting the baseline).
 * 2) It is screen-reader unfriendly.
 * 3) AFAIK the wiki software has some heuristics which allows it to format math the proper way depending on the browser used for viewing, or on user preferences, which is circumvented by using \,\!.

I'll happily delete all occurrences of \,\! in this article, but I thought I'd maybe ask first :) --- Papppfaffe (talk) 20:52, 27 April 2011 (UTC)

 * I agree. — MFH:Talk 14:56, 12 February 2012 (UTC)

 * I have removed all uses of . In my browser, this made no visible difference in the entire article, which is good. I have also removed extraneous uses of , which in three cases made no difference and in two cases it looks better to me. ✅ --RainerBlome (talk) 10:39, 19 December 2019 (UTC)

Reference to article with NPOV issues
This is a page on a well-established topic and is generally well-sourced. However, one sentence in one section refers to an article under clear violation of NPOV. This sentence also uses language that reflects a general lack of neutrality. I suggest removal of this sentence. -V madhu (talk) 17:06, 26 September 2018 (UTC)

Formatting the Definition
With 3 browsers (IE, FireFox, Opera) the version https://en.wikipedia.org/w/index.php?title=Moore%E2%80%93Penrose_inverse&oldid=931017645 looks best. So far, vertical-align is applied to 3 cells in the first row, because the 4th cell is the widest of all cells. top is more conventional as bottom. Your last version does not look well when the window is narrowed. Best regards, --Nomen4Omen (talk) 17:19, 16 December 2019 (UTC)

 * , thanks for testing with other browsers! You are right, with very narrow windows the latest version did not work well. I hope I fixed it now, not just for Firefox. Could you please check with IE and Opera, as I don't have those?
 * I wrote in the edit comment: "top" was wrong anyway. That was mostly wrong itself. I thought that the intent of the `vertical-align` was to get the baselines aligned, but that was wrong. When text starts to wrap due to a narrow window, it should float at the top of the table cells, that's the purpose, as I see now. `vertical-align:top` does exactly that, so `top` it is now. Sorry for my ignorance. :-)
 * To align the baseline of the lone A in the first row, I first tried to append `^\phantom{+}, but MediaWiki's LaTeX processor did not understand this. I have also tried to use `^\quad` for that purpose, but it does not affect alignment (no surprise there). I have now added an transparent `^+`, the lone A is now aligned. The advantage of `\phantom` would have been that selecting text would not pick up the operator. As it stands, selecting text in that table does not work as expected anyway, so no (more) harm done.
 * What do you think? --RainerBlome (talk) 23:51, 16 December 2019 (UTC)

Writing K in Blackboard bold?
I'd like to propose writing the field $$K$$ in Blackboard bold $$\mathbb{K} := \R \vee \Complex $$ or $$\mathbb{k} := \R \vee \Complex. $$ This would be especially helpful if the field $$K$$ in section Moore–Penrose inverse is NOT meant to be $$\R \vee \Complex, $$ a thing which remains unclear with the current notation. --Nomen4Omen (talk) 10:36, 19 December 2019 (UTC)

 * ✅ except sections Moore–Penrose inverse thru Moore–Penrose inverse. --Nomen4Omen (talk) 16:26, 19 December 2019 (UTC)

 * What kind of object is the $$R $$ in section Moore–Penrose inverse. Because $A \in R^{n\times n}$ can be Hermitian it is quite probable that this $$R == \mathbb{K} . $$
 * Section Moore–Penrose inverse does not seem to require $$K == \mathbb{K}, $$ but it contains the grammatically awkward phrase "These imply that $A^+$ is defined on $\operatorname{ran} A$ to be the inverse of this isomorphism, and on $$\left(\operatorname{ran} A\right)^\perp$$ to be zero." I changed this phrase as I understand it.
 * Sections Moore–Penrose inverse and Moore–Penrose inverse seem to require $$K == \mathbb{K}, $$ because of the limits. --Nomen4Omen (talk) 15:07, 20 December 2019 (UTC)

 * You wrote "Because $A \in R^{n\times n}$ can be Hermitian it is quite probable that this $$R == \mathbb{K}. $$" Sheesh, I found that one hard to parse. :-) Took me minutes to understand, I'm not joking. I'm not a native speaker, but I'd add a comma.
 * For reference, that paragraph was introduced by IP edit https://en.wikipedia.org/w/index.php?title=Moore%E2%80%93Penrose_inverse&diff=761062582&oldid=753802446, the edit comment does not help here.
 * If I understand correctly, you mean because "is $A$ hermitian?" can be asked, $R$ must be $\mathbb{K}$. Sounds good to me. I guess that at the time they wrote this, the author meant $K$.

 * Regarding the original question, in the geometric construction section, in how far would it help if $K$ is not meant to be $\R \vee \Complex$? To keep the section as general as it is?

 * I suggest to use the ✅ marker only when all issues discussed in the entire discussion section are done. For me, the "done" marker means "no need to look at this section any more, can be archived".
 * --RainerBlome (talk) 19:34, 22 December 2019 (UTC)

 * Because we do not really know of Moore–Penrose inverses over $K \ne \R$ or $K \ne \Complex$, and we know that $K = \R \vee \Complex$ always works, I propose to write $\mathbb{K}$ throughout the article and let the discernment up to the knowledgeable reader. --Nomen4Omen (talk) 10:24, 23 December 2019 (UTC)

 * I agree that the same notation should be used throughout the article. As long as we define it, we can use either variant of K. Personally, I would have left it at plain K until LaTeX understands unicode 𝕂. (:-)
 * Regarding the geometric construction section, I still do not understand why you did not change the notation there along with the rest of the article. As far as I can see, K is not really restricted to R or C anywhere in the article, except by the notation definition.
 * In the "Limit relations" section, ð is an element of R, not of K.
 * In the "Derivative" section, K is not mentioned, and d/dx is not clearly defined. I assume that the total derivative or Fréchet derivative is meant. I have no access to the reference given there, can anyone provide a free one? In the implied "lim h -> 0", h is an element of K, but K can be anything as long as you manage to drive h to zero. For example, a normed vector space would work. I can imagine that the derivative as given in that section does not always exist. At least d/dx A(x) and d/dx A^T(x) need to exist for the given expression to work.
 * Regarding K other than R or C, I disagree. We do know other kinds of suitable spaces K, see Moore–Penrose inverse. Everything follows from the axioms at the top. Whenever these all work, the inverse discussed here exists and is unique. As an example, if we call the field of biquaternions $\mathbb B$ (the "ordinary" variant with complex coefficients), it works with all B^n×m matrices, as Theorem 3.5 in this paper shows. This allows us to generalize the definition of $\mathbb K$ from $\R \vee \Complex$ to $\R \vee \Complex \vee \mathbb B$. I have added that to the article in the Generalizations section.
 * What do you mean by discernment? --RainerBlome (talk) 00:25, 24 December 2019 (UTC)

Added generalization to all fields along with example
Added generalization to all fields along with example. Could this be expressed more clearly? --Svennik (talk) 10:47, 27 November 2020 (UTC)

 * Without having looked at this in detail, the restriction "doesn't always have a pseudoinverse" leads me to believe that that paragraph would be better suited in the article on generalized inverses. One of the salient points of the Moore–Penrose inverse is that it always exists (for R, C and B Matrices). --RainerBlome (talk) 23:52, 17 January 2021 (UTC)
 * But when it exists, it's unique, unlike generalized inverses. --Svennik (talk) 13:26, 18 January 2021 (UTC)

Remark to changes of 20 Dec 2020
Reason: it is typographically closer to $\mathbf{K}$ and $\mathbb{k}$. –Nomen4Omen (talk) 17:48, 20 December 2020 (UTC)
 * 1) As user:84.246.203.253 prefers (MOS:VAR !!) $\mathbb{R}$, others such as me prefer $\mathbb{C}$.
 * 1) Changed also $$K$$ to $\mathbb{k}$ in §§ Moore–Penrose inverse and Moore–Penrose inverse, because of the occurrence of $$A^+$$ in both §§ — which would be undefined if $K \not \in \{\R,\Complex\}$.
 * 2) Changed AB in formulas to A B, so that it is easier to change one of them by means of an editor which supports searching for whole words.
 * 3) A few typos.

Please introduce notation
Special:Diff/1090367874 introduced properties that can be expressed in a simple sentence, but instead using notation that is not universally understood. Syntax seems to be "A matrix is a set of tuples of coordinates (which are themselves tuples of two index values), and values in $\mathbb{K}$". Please prefer to use simpler notation, and introduce the notation in the notation section. I also think that the notation is questionable, but I'm not even 100% sure I understand the author's intent. RainerBlome (talk) 00:31, 16 September 2023 (UTC)
 * Special:Diff/1168148932 should have changed $\mathbb k$ to $\mathbb{K}$, shouldn't it? If yes, the error could have been avoided if the local convention of using braces  had been used in the first place. I fixed this.
 * The $\times$ operator seems overloaded, meaning two different things in the same expression. Neither of these exactly matches its use ("m x n") in the notation section.
 * Dimensions m and n are permitted to be zero, but this is unlikely to make sense. I fixed this.

Biquaternion nonsense
I think some of the hypercomplex stuff on Wikipedia is kind of trivial, and is given false prominence. For instance, the "biquaternion" nonsense is just the 2x2 complex matrices. So it's literally talking about block matrices in an obscure and confusing way. Wikipedia might need a cleanup of this stuff. --Svennik (talk) 15:07, 16 September 2023 (UTC)
 * Can we please avoid judgment like "nonsense" and "trivial"? Like any encyclopedia, Wikipedia contains a lot of info that many deem trivial. But what seems trivial to you or me may not be so obvious to other readers. The whole point of an encyclopedia is to provide knowledge that the reader did not have before, or to confirm it. But back on topic:
 * Yes, biquaternions (Let's denote them with $$\mathbb{Q}$$.) behave like 2 × 2 complex matrices. If the question was whether the concept of the pseudoinverse of a biquaternion is valid, there would indeed not be much value in mentioning this, for most readers. But the paragraph you removed talks about the pseudoinverse of $$m \times n$$ matrixes over $$\mathbb{K} = \mathbb{Q} $$, whose elements are biquaternions.
 * Maybe such a matrix of 2x2 matrixes can be "flattened", and, (blindly) following your argument, is equivalent to some kind of block matrix with complex elements, but if so, this is far from obvious to me. Do you agree?
 * RainerBlome (talk) 18:15, 19 September 2023 (UTC)
 * Unless the biquaternions are given an unusual involution, an $$m \times n$$ matrix over the biquaternions is essentially a $$2m \times 2n$$ matrix over the complex numbers, with the conjugate-transpose operation being the usual one. Formally, this is an isomorphism of two dagger categories: One consisting of matrices over the complex numbers with an even number of rows and columns, and the other consisting of matrices over the "biquaternions". Under this isomorphism, the result you're referring to is not very hard. I think a remark about the use of block matrices to extend the notion of pseudoinverse from *-fields to (some) *-algebras would be appropriate here. I don't know how clear this is. I'll take on board what you said about being more careful with my language. Thank you. --Svennik (talk) 19:13, 19 September 2023 (UTC)

Define Support
There seem to be many overlapping terms in this topic which can be confusing. For example "column space" is the same thing as "image". But the term "support" is used but not defined. Please can someone knowledgeable define it? Bodger Boffin (talk) 14:33, 9 October 2023 (UTC)

 * ✅—Anita5192 (talk) 15:16, 9 October 2023 (UTC)

Projection vs Orthogonal Projection
In the Definition section, it is stated that "Note that ... are orthogonal projection operators, as follows from ..." (Sorry, copy and paste deleted the math expressions.) But I believe the conditions cited, P^2 = P, are those for "projection," not "orthogonal projection." The Properties / Projectors section properly cites both conditions, namely P^2 = P for projection, and, in addition, P^H = P, for orthogonal projection.

I would edit the article, but I'm not an expert in this area. QRManual (talk) 14:47, 18 April 2024 (UTC)

title: Talk:Moore–Penrose inverse