U.S. Secret Service agents stand watch as Republican presidential candidate and former Massachusetts Gov. Mitt Romney and vice presidential candidate Rep. Paul Ryan, R-Wis., campaign at

 

              U.S. Secret Service agents stand watch as Republican presidential candidate and former Massachusetts Gov. Mitt Romney and vice presidential candidate Rep. Paul Ryan, R-Wis., campaign at
U.S. Secret Service agents stand watch as Republican presidential candidate and former Massachusetts Gov. Mitt Romney and vice presidential candidate Rep. Paul Ryan, R-Wis., campaign at the Celina Fieldhouse in Celina, Ohio, Sunday, Oct. 28, 2012. (AP Photo/Charles Dharapak)