The following is a timeline of the Presidency of Barack Obama from his inauguration as president of the United States on January 20, 2009, to December 31, 2009.
 For his time as President-elect, see the Presidential transition of Barack Obama; for a detailed account of his first months in office, see First 100 days of Barack Obama's presidency; for a complete itinerary of his travels, see List of presidential trips made by Barack Obama.
The Iowa Democratic Presidential Caucus occurred on January 3, 2008, and was the state caucuses of the Iowa Democratic Party.
 It was the first election for the Democrats of the 2008 presidential election.
 Also referred to as "the First in the Nation Caucus," it was the first election of the primary season on both the Democratic and Republican sides.
 Of the eight major Democratic presidential candidates, then-U.S. Senator Barack Obama of Illinois received the most votes and was ultimately declared the winner of the Iowa Democratic Caucus of 2008, making him the first African American to win the caucus.
 Former U.S. Senator John Edwards of North Carolina came in second place and then-U.S. Senator Hillary Clinton of New York finished third, though Clinton received more delegates than Edwards.
 Campaigning had begun as early as two years before the event.
Barack Obama was elected President of the United States on November 4, 2008 and his first inauguration occurred on January 20, 2009.
 Re-elected on November 6, 2012, his second inauguration was on January 21, 2013.
 For President Obama's first 100 days in office, see First 100 days of Barack Obama's presidency.
 For his time as President-elect, see Presidential transition of Barack Obama.
 The following articles cover the timeline of the presidency of Barack Obama:
The Colorado Democratic Presidential Caucus took place on Super Tuesday, February 5, 2008.
 As he did in every other state that held a caucus rather than a primary, Barack Obama won the caucus by a wide, two-to-one margin over Hillary Clinton.
Hillary Diane Rodham Clinton ( ; born October 26, 1947) is an American politician who was the First Lady of the United States from 1993 to 2001, U.S. Senator from New York from 2001 to 2009, 67th United States Secretary of State from 2009 to 2013, and the Democratic Party's nominee for President of the United States in the 2016 election.
Patricia A. "Pat" Waak (born February 1, 1943) is the former chair of the Colorado Democratic Party.
 A population and environmental policy analyst and consultant, Waak was elected to chair the Colorado Democratic Party in 2005.
 She led the party as it saw statewide gains in 2006 and won the right to host the Democratic National Convention.
 A superdelegate to the national convention, Waak publicly endorsed Sen. Barack Obama in late May 2008.
The Nebraska Democratic Presidential Caucuses took place on February 9, 2008, where 24 of the state's 31 convention delegates were chosen.
 Like he did throughout many other states that held caucuses instead of primaries, Barack Obama won the Nebraska Democratic Caucus by more than a two-to-one margin of victory over Hillary Clinton.
 On May 13, 2008, the state also held a non-binding primary election which Obama also won but the margin of victory was considerably smaller.
Shefali Razdan Duggal (born November 22, 1971) is an Indian-born American Democratic political activist in San Francisco who is a Presidential Appointee to President Barack Obama to the United States Holocaust Memorial Council, which supervises the United States Holocaust Memorial Museum, for a term expiring in January 2018.
 She was an active fundraiser for the Barack Obama election campaign in 2008 where she was a Trustee for the DNC South Asian American Leadership Council.
 She focused on South Asian and Young Professional outreach, co-hosting a number of fundraising events for both the Senator and his surrogates.
 She was a member of President Barack Obama's National Finance Committee for his reelection campaign in 2012, a co-chair for Obama Victory Trustees, and the Northern California Finance Committee.
 She worked on the Massachusetts Democratic Party, New Hampshire Democratic Party, and Senators Ted Kennedy and Dianne Feinstein.
 She also worked on the Al Gore presidential campaign in 2000, and Hillary Clinton’s presidential campaign in 2008.
Game Change: Obama and the Clintons, McCain and Palin, and the Race of a Lifetime is a book by political journalists John Heilemann and Mark Halperin about the 2008 United States presidential election.
 Released on January 11, 2010, it was also published in the United Kingdom under the title Race of a Lifetime: How Obama Won the White House.
 The book is based on interviews with more than 300 people involved in the campaign.
 It discusses factors including Democratic Party presidential candidate John Edwards' extramarital affair, the relationship between Democratic presidential nominee Barack Obama and his vice presidential running mate Joe Biden, the failure of Republican Party candidate Rudy Giuliani's presidential campaign and Sarah Palin's vice presidential candidacy.
The Idaho Democratic Caucus was overwhelmingly won by Barack Obama, who won 15 of Idaho's 18 delegates, 44 of the 45 county-level caucuses, and the support of 79.54 percent of caucus attendees statewide, his largest margin of victory in any state during the 2008 Democratic Presidential Primary season.
 A handful of caucus attendees pledged to support John Edwards on the first ballot even though he had dropped out of the race the previous week; this residual support was sufficient to give him a third-place finish.

Question: Barack Obama won the Colorado Democratic Presidential caucus by a wide, two-to-one margin over which American politician who was the First Lady of the United States from 1993 to 2001?
Answer: Hillary Clinton