President Barack Obama walks to greet people waiting for him on the tarmac as he arrives at O'Hare International Airport on Air Force One, Saturday, Aug. 11, 2012, in Chicago. (AP Photo/Carolyn Kaster)

Associated Press
President Barack Obama walks to greet people waiting for him on the tarmac as he arrives at O'Hare International Airport on Air Force One, Saturday, Aug. 11, 2012, in Chicago. (AP Photo/Carolyn Kaster)
President Barack Obama walks to greet people waiting for him on the tarmac as he arrives at O'Hare International Airport on Air Force One, Saturday, Aug. 11, 2012, in Chicago. (AP Photo/Carolyn Kaster)
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