President Barack Obama speaks in front of a corn field during a campaign stop at the Nelson Pioneer Farm in Oskaloosa, Iowa, Tuesday, Aug. 14, 2012. The president is on a three-day campaign bus tour through Iowa. (AP Photo/Nati Harnik)

Associated Press
President Barack Obama speaks in front of a corn field during a campaign stop at the Nelson Pioneer Farm in Oskaloosa, Iowa, Tuesday, Aug. 14, 2012. The president is on a three-day campaign bus tour through Iowa. (AP Photo/Nati Harnik)
President Barack Obama speaks in front of a corn field during a campaign stop at the Nelson Pioneer Farm in Oskaloosa, Iowa, Tuesday, Aug. 14, 2012. The president is on a three-day campaign bus tour through Iowa. (AP Photo/Nati Harnik)
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