President Barack Obama and first lady Michelle Obama greet people in the crowd during a campaign event at University of Iowa, Friday, Sept. 7, 2012, in Iowa City, Iowa. (AP Photo/Carolyn Kaster)

Associated Press
President Barack Obama and first lady Michelle Obama greet people in the crowd during a campaign event at University of Iowa, Friday, Sept. 7, 2012, in Iowa City, Iowa.  (AP Photo/Carolyn Kaster)
President Barack Obama and first lady Michelle Obama greet people in the crowd during a campaign event at University of Iowa, Friday, Sept. 7, 2012, in Iowa City, Iowa. (AP Photo/Carolyn Kaster)
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