President Barack Obama greets people waiting for him on the tarmac as he arrives on Air Force One at Rickenbacker International Airport, Sunday, May 5, 2013, in Columbus, Ohio, en route to speak at the Ohio State University spring commencement. (AP Photo/Carolyn Kaster)

Associated Press
President Barack Obama greets people waiting for him on the tarmac as he arrives on Air Force One at Rickenbacker International Airport, Sunday, May 5, 2013, in Columbus, Ohio, en route to speak at the Ohio State University spring commencement. (AP Photo/Carolyn Kaster)
President Barack Obama greets people waiting for him on the tarmac as he arrives on Air Force One at Rickenbacker International Airport, Sunday, May 5, 2013, in Columbus, Ohio, en route to speak at the Ohio State University spring commencement. (AP Photo/Carolyn Kaster)
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