Kind of an asshole, apparently. I'm with James Bowman on this; Stewart wants to be able to spew bitter, vicious invective without being called on his opinions. I don't mind that he thinks Crossfire sucks (personally I just find it tedious, but then, I don't assume all programming is tailored to please me), or that he went on Crossfire just to tell its hosts that they suck--I mind him using "I'm just a comedian" as a shield from criticism. He wants his opinions taken seriously, but he doesn't want to be called on them, and I doubt he'd be terribly gracious to a guest who came on his show specifically to tell him he was "hurting America" by not being funny. Which he hasn't been since he realized he could use his position to stump for the dems.