FILE - In this Aug. 25, 2012 file photo, Republican presidential candidate, former Massachusetts Gov. Mitt Romney and his vice presidential running mate Rep. Paul Ryan, R-Wis., arrive for a campaign rally in Powell, Ohio. They're the political world's newest odd couple: Mitt Romney and Paul Ryan are bound by substance, but dramatically different in style. The running mates share a love of policy, and a fascination with the world's economy and America's place in it. But where Romney is buttoned-up and reserved on the campaign trail, Ryan is relaxed and exudes a natural enthusiasm. (AP Photo/Evan Vucci, File)