Joe Klein tells an interesting story:

Ifshin, you see, had been a vehement anti-Vietnam radical. He had even gone to Hanoi at the height at the war and given a speech denouncing the American pilots dropping bombs on North Vietnamese civilians as “war criminals.” The speech was broadcast repeatedly in the Hanoi Hilton, where McCain was being held captive. More than a few people thought Ifshin was guilty of treason.