Republican presidential candidate Mitt Romney (right) listens as his vice presidential running mate, Rep. Paul Ryan, speaks during a campaign stop at the NASCAR Technical Institute on Sunday, Aug. 12, 2012, in Mooresville, N.C. (AP Photo/Mary Altaffer)

Photo by: Mary Altaffer

Republican presidential candidate Mitt Romney (right) listens as his vice presidential running mate, Rep. Paul Ryan, speaks during a campaign stop at the NASCAR Technical Institute on Sunday, Aug. 12, 2012, in Mooresville, N.C. (AP Photo/Mary Altaffer)