Sadly, there is such a wealth of treasonous pr*cks to choose from, but I'm betting it was this odious, lick-spittle, America-hating P.O.S. (He's a councilman in New York City.)
COUNCIL MEMBER - DISTRICT 42 Charles Barron - Democrat
Well, he seems like he's a candidate (it does say "Democrat" next to his name), but this guy on O'Reilly's show wasn't an elected official. I think he was from some liberal think tank (if that's even a physical possibility).