President Barack Obama's campaign bus bus pulls up to pick up the 

President Barack Obama's campaign bus bus pulls up to pick up the president as he arrives at Offutt Air Force Base in Bellevue, Monday, Aug. 13, 2012, en route to a three day campaign bus tour through Iowa. (AP Photo/Carolyn Kaster)
Associated Press
President Barack Obama's campaign bus bus pulls up to pick up the president as he arrives at Offutt Air Force Base in Bellevue, Monday, Aug. 13, 2012, en route to a three day campaign bus tour through Iowa. (AP Photo/Carolyn Kaster)
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