Obama's presidential highlights

President Barack Obama greets troops as they step off a plane on the tarmac at Andrews Air Force Base, Md., Tuesday, Dec. 20, 2011, during a ceremony marking the return of the United States Forces-Iraq Colors and the end of the war in Iraq. (AP Photo/Carolyn Kaster)

President Barack Obama greets troops as they step off a plane on the tarmac at Andrews Air Force Base, Md., Tuesday, Dec. 20, 2011, during a ceremony marking the return of the United States Forces-Iraq Colors and the end of the war in Iraq. (AP Photo/Carolyn Kaster)