President Barack Obama boards Air Force One before his departure from Andrews Air Force Base, Md., Tuesday, Aug., 28, 2012. Obama is traveling to campaign in Iowa and Colorado today(AP Photo/Pablo Martinez Monsivais)

Associated Press
President Barack Obama boards Air Force One before his departure from Andrews Air Force Base, Md., Tuesday, Aug., 28, 2012. Obama is traveling to campaign in Iowa and Colorado today(AP Photo/Pablo Martinez Monsivais)
President Barack Obama boards Air Force One before his departure from Andrews Air Force Base, Md., Tuesday, Aug., 28, 2012. Obama is traveling to campaign in Iowa and Colorado today(AP Photo/Pablo Martinez Monsivais)
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