President Barack Obama greets supporters after speaking at a campaign stop at The Mississippi Valley Fairgrounds, Wednesday, Oct. 24, 2012, in Davenport, Iowa. The President is on a two day campaign trip across six battleground states. (AP Photo/Charlie Neibergall)

Associated Press
President Barack Obama greets supporters after speaking at a campaign stop at The Mississippi Valley Fairgrounds, Wednesday, Oct. 24, 2012, in Davenport, Iowa. The President is on a two day campaign trip across six battleground states. (AP Photo/Charlie Neibergall)
President Barack Obama greets supporters after speaking at a campaign stop at The Mississippi Valley Fairgrounds, Wednesday, Oct. 24, 2012, in Davenport, Iowa. The President is on a two day campaign trip across six battleground states. (AP Photo/Charlie Neibergall)
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