"Hillary Clinton really transformed herself into a national security expert. She decided to join the Senate Armed Services Committee, and she became a real military wonk. She was famous for going to every subcommittee hearing and methodically questioning every lieutenant colonel from the Pentagon about defense procurement or selective service benefits. So that's where she really began to carve out and hone this reputation as a hawk that I think has followed her through the secretary of state years and then into the presidential campaign."