2001-2003 - Chairman of the Senate Foreign Relations Committee.

2002 - Votes to authorize military intervention in Iraq, but later becomes a vocal critic of the conflict.

2007-2009 - Chairman of the Senate Foreign Relations Committee.

January 31, 2007 - Files a statement of candidacy with the Federal Elections Commission to run for president.

August 1, 2007 - Releases his memoir, "Promises to Keep: On Life and Politics."

January 3, 2008 - Announces his withdrawal from the presidential race.

August 23, 2008 - Is named the vice presidential running mate of Barack Obama.

November 4, 2008 - Is elected vice president of the United States.

January 15, 2009 - Resigns from the Senate.

January 20, 2009 - Is sworn in as vice president of the United States.