Incumbents
- President: George W. Bush (Republican) (until January 20), Barack Obama (Democratic) (starting January 20)
- Vice President: Dick Cheney (Republican) (until January 20), Joe Biden (Democratic) (starting January 20)
- Chief Justice: John Roberts
- Speaker of the House of Representatives: Nancy Pelosi (D-California)
- Senate Majority Leader: Harry Reid (D-Nevada)
- Congress: 110th (until January 3), 111th (starting January 3)
Read more about this topic: 2009 In The United States