President Barack Obama moves to wave as he boards Air Force One, Saturday, Aug. 11, 2012, in Andrews Air Force Base, Md., en route to Chicago. (AP Photo/Carolyn Kaster)

Associated Press
President Barack Obama moves to wave as he boards Air Force One, Saturday, Aug. 11, 2012, in Andrews Air Force Base, Md., en route to Chicago. (AP Photo/Carolyn Kaster)
President Barack Obama moves to wave as he boards Air Force One, Saturday, Aug. 11, 2012, in Andrews Air Force Base, Md., en route to Chicago. (AP Photo/Carolyn Kaster)
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