President Barack Obama speaks during a campaign event at the University of Iowa, Friday, Sept. 7, 2012 in Iowa City, Iowa. (AP Photo/Pablo Martinez Monsivais)

 

              President Barack Obama speaks during a campaign event at the University of Iowa, Friday, Sept. 7, 2012 in Iowa City, Iowa. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama speaks during a campaign event at the University of Iowa, Friday, Sept. 7, 2012 in Iowa City, Iowa. (AP Photo/Pablo Martinez Monsivais)