A sign promoting the vice presidential debate is held up at a rally on the Centre College campus, site of the debate, Thursday, Oct. 11, 2012, in Danville, Ky. Vice President Joe Biden will face Republican vice presidential candidate, Rep. Paul Ryan, R-Wis. (AP Photo/Eric Gay)

Photo by: Eric Gay

A sign promoting the vice presidential debate is held up at a rally on the Centre College campus, site of the debate, Thursday, Oct. 11, 2012, in Danville, Ky. Vice President Joe Biden will face Republican vice presidential candidate, Rep. Paul Ryan, R-Wis. (AP Photo/Eric Gay)