Republican vice presidential nominee Rep. Paul Ryan of Wisconsin and Vice President Joe Biden pass each other after the vice presidential debate at Centre College, in this Oct. 11, 2012 photo taken in Danville, Ky. (AP Photo/Charlie Neibergall, File)

Photo by: Charlie Neibergall

Republican vice presidential nominee Rep. Paul Ryan of Wisconsin and Vice President Joe Biden pass each other after the vice presidential debate at Centre College, in this Oct. 11, 2012 photo taken in Danville, Ky. (AP Photo/Charlie Neibergall, File)