[U.S. Vice President Joe Biden and Republican challenger Congressman Paul Ryan (R-WI) meet for their only debate of the 2012 campaign].
Vice President Joe Biden and Republican challenger Congressman Paul Ryan (R-WI) meet for their only debate of the 2012 campaign. ABC reporter Martha Raddatz moderates. The debate begins with a discussion of Libya and the death of the U.S. ambassador. Biden defends the administration's response while...