President Barack Obama speaks at a campaign event, Wednesday, Aug. 15, 2012, in Davenport, Iowa, during a three day campaign bus tour through Iowa. (AP Photo/Carolyn Kaster)

Associated Press
President Barack Obama speaks at a campaign event, Wednesday, Aug. 15, 2012, in Davenport, Iowa,  during a three day campaign bus tour through Iowa. (AP Photo/Carolyn Kaster)
President Barack Obama speaks at a campaign event, Wednesday, Aug. 15, 2012, in Davenport, Iowa, during a three day campaign bus tour through Iowa. (AP Photo/Carolyn Kaster)
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