President Barack Obama laughs as he talks with people during a visit to the Iowa State Fair, Monday, Aug. 13, 2012, in Des Moines, Iowa. The president is on a three-day campaign bus tour through Iowa. (AP Photo/Carolyn Kaster)

Associated Press
President Barack Obama laughs as he talks with people during a visit to the Iowa State Fair, Monday, Aug. 13, 2012, in Des Moines, Iowa. The president is on a three-day campaign bus tour through Iowa. (AP Photo/Carolyn Kaster)
President Barack Obama laughs as he talks with people during a visit to the Iowa State Fair, Monday, Aug. 13, 2012, in Des Moines, Iowa. The president is on a three-day campaign bus tour through Iowa. (AP Photo/Carolyn Kaster)
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