Sen. John McCain set a record as the most frequent guest on "Face the Nation." He appeared 112 times, and most of those interviews were with CBS News contributor Bob Schieffer. Schieffer joins "CBS This Morning" along with CBS News senior national security analyst Fran Townsend to discuss McCain's impact. Townsend, former homeland security adviser to President George W. Bush, worked with McCain on immigration and describes him as a mentor and friend.
