DANVILLE, KY - OCTOBER 11:  U.S. Vice President Joe Biden (L) shakes hands with Republican vice presidential candidate U.S. Rep. Paul Ryan (R-WI) (R) after the vice presidential debate at Centre College October 11, 2012 in Danville, Kentucky.  This is the second of four debates during the presidential election season and the only debate between the vice presidential candidates before the closely-contested election November 6.  (Photo by Justin Sullivan/Getty Images) Photo: Justin Sullivan, Getty Images / 2012 Getty Images