President Barack Obama greets people at DeWitt Dairy Treats, Tuesday, Aug. 16, 2011, in DeWitt, Iowa, during his three-day economic bus tour. (AP Photo/Carolyn Kaster)

Associated Press
President Barack Obama greets people at DeWitt Dairy Treats, Tuesday, Aug. 16, 2011, in DeWitt, Iowa, during his three-day economic bus tour. (AP Photo/Carolyn Kaster)
President Barack Obama greets people at DeWitt Dairy Treats, Tuesday, Aug. 16, 2011, in DeWitt, Iowa, during his three-day economic bus tour. (AP Photo/Carolyn Kaster)
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