International Business TimesWho Are The ABC Republican Debate Moderators? Martha Raddatz, David Muir To Oversee New Hampshire DebateInternational Business TimesRTX1ZF5G Debate moderators David Muir and Martha Raddatz speak to the audience before the Democratic U.S. presidential candidates debate at St. Anselm College in Manchester, New Hampshire, Dec. 19, 2015. Photo: Reuters.