Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, listens to his 

Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, listens to his vice presidential running mate Rep. Paul Ryan, R-Wis., campaign at the NASCAR Technical Institute  Sunday, Aug. 12, 2012. in Mooresville, N.C.  (AP Photo/Mary Altaffer)
Associated Press
Republican presidential candidate, former Massachusetts Gov. Mitt Romney, right, listens to his vice presidential running mate Rep. Paul Ryan, R-Wis., campaign at the NASCAR Technical Institute Sunday, Aug. 12, 2012. in Mooresville, N.C. (AP Photo/Mary Altaffer)
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