President Barack Obama speaks at a campaign event at University of Iowa, Friday, Sept. 7, 2012, in Iowa City, Iowa. (AP Photo/Carolyn Kaster)

 

              President Barack Obama speaks at a campaign event at University of Iowa, Friday, Sept. 7, 2012, in Iowa City, Iowa.  (AP Photo/Carolyn Kaster)
President Barack Obama speaks at a campaign event at University of Iowa, Friday, Sept. 7, 2012, in Iowa City, Iowa. (AP Photo/Carolyn Kaster)