Sarah Palin in the context of "John McCain"

Barack Hussein Obama II (born August 4, 1961) is an American politician who served as the 44th president of the United States from 2009 to 2017. A member of the Democratic Party, he was the first African American president. Obama previously served as a U.S. senator representing Illinois from 2005 to 2008 and as an Illinois state senator from 1997 to 2004.

Born in Honolulu, Hawaii, Obama graduated from Columbia University in 1983 with a Bachelor of Arts degree in political science and later worked as a community organizer in Chicago. In 1988, Obama enrolled in Harvard Law School, where he was the first black president of the Harvard Law Review. He became a civil rights attorney and an academic, teaching constitutional law at the University of Chicago Law School from 1992 to 2004. In 1996, Obama was elected to represent the 13th district in the Illinois Senate, a position he held until 2004, when he successfully ran for the U.S. Senate. In the 2008 presidential election, after a close primary campaign against Hillary Clinton, he was nominated by the Democratic Party for president. Obama selected Joe Biden as his running mate and defeated Republican nominee John McCain and his running mate Sarah Palin.

Presidential elections were held in the United States 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.

Incumbent Republican president George W. Bush was ineligible to pursue a third term due to the term limits established by the Twenty-second Amendment; this was the first election since 1952 in which neither the incumbent president nor vice president was on the ballot, and the first since 1928 in which neither ran for the nomination. McCain secured the Republican nomination by March 2008, defeating his main challengers Mitt Romney and Mike Huckabee, and selected Palin as his running mate. 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 who dropped out before most of the primaries were held, including Senators John Edwards and 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 narrowly secured the Democratic nomination in June 2008 and selected Biden as his running mate.

Joe Biden served as the 47th vice president of the United States during the presidency of Barack Obama from January 20, 2009, to January 20, 2017. Biden, a member of the Democratic Party who previously served as a senior U.S. senator representing Delaware from 1973 to 2009, was selected as Obama's running mate and took office following their victory in the 2008 presidential election over Republican nominees John McCain and Sarah Palin. Four years later, in the 2012 presidential election, they defeated Republican nominees Mitt Romney and Paul Ryan, to win re-election. Biden was the first vice president from Delaware and the first Roman Catholic vice president in U.S. history.

Alongside Biden's vice presidency, the Democratic Party also held their majorities in the House of Representatives and the Senate during the 111th U.S. Congress following the 2008 elections, attained an overall federal government trifecta. Biden was more influential than most vice presidents due to his long Senate career and relationships with both members of Congress and politicians abroad. His relationship with Republican Senate leader Mitch McConnell was particularly important after the Republicans regained control of Congress in the 2010 and 2014 elections, and the two were instrumental in ending the 2011 and 2013 debt-ceiling crises.