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Republican Vice-Presidential nominee Paul Ryan (R) and Vice-President Joe Biden (L) listen to question from moderator Martha Raddatz at the 2012 vice-presidential debate at Centre College in Danville, Kentucky, Thursday, October 11, 2012 (Credit: Christopher Dilts for Obama for America via Flickr)

Republican Vice-Presidential nominee Paul Ryan (R) and Vice-President Joe Biden (L) listen to question from moderator Martha Raddatz at the 2012 vice-presidential debate at Centre College in Danville, Kentucky, Thursday, October 11, 2012 (Credit: Christopher Dilts for Obama for America via Flickr)