In this picture: David Muir, left, and Martha Raddatz
No one seemed more prepared than Martha Raddatz, chief global affairs correspondent for ABC News, who teamed with ABC anchor David Muir to moderate a debate with Democrats in December.
Raddatz was at her best in pushing Clinton with pointed and informed follow-up questions about how she would fight terrorism.
Case in point: When she challenged Clinton on her talk about a "no-fly zone" in Syria.
“ISIS doesn't have aircraft. Al Qaeda doesn't have aircraft," Raddatz said. "So would you shoot down a Syrian military aircraft or a Russian airplane?”
Jim Cole / Associated Press