There are petitions out there to have Jon Stewart host one of the presidential debates, preferably a Republican one. As much as I admire Mr. Stewart and already miss him on the air, I don't think that's a good idea. The debate's supposed to be about the candidates and that one would wind up being primarily about Stewart. All the moderator is supposed to do is ask good questions and then jump in if anyone filibusters or goes over their time or anything.
I would love to see him have a back-and-forth dialogue with some of those candidates about the issues but that's not what a moderator's supposed to do…and can't with ninety-six people or however many they'll have on stage.
I also don't think Republican candidates should have the "out" they often employ when they can't answer basic questions or answer them poorly. They complain the questioner was asking things designed to make them look bad. If some of them bitched about Fox Newscasters doing that, what would they say about one of the nation's most prominent Liberals? He'd ask them if they were ready to start and they'd call it a "gotcha" question.