Republican presidential candidate and former Massachusetts Gov. Mitt Romney campaigns with Sen. Rob Portman, Ohio Republican, in front of The Golden Lamb inn and restaurant in Lebanon, Ohio, Saturday, Oct. 13, 2012. (AP Photo/Charles Dharapak)

Photo by: Charles Dharapak

Republican presidential candidate and former Massachusetts Gov. Mitt Romney campaigns with Sen. Rob Portman, Ohio Republican, in front of The Golden Lamb inn and restaurant in Lebanon, Ohio, Saturday, Oct. 13, 2012. (AP Photo/Charles Dharapak)