Barf, you actually watch him? It's like he went to Comedy Central and said "can I do a piss-poor parody of O'Reilly after the Daily Show?" And they thought "Stephen, you magnificent bastard!"
Yeah, it's funny. I like to laugh. I know he's a Dem and is joking about it, but he spends the whole show slamming Democrats - like when he beat up a DNC pinata with a baseball bat. Slamming Dems is funny to me.
O'Reilly gets a kick out of it and said it flatters him. Stewart however I don't watch for obvious reasons.