Jon Stewart is exactly the same guy he's always been, only with money. He knows that the moment he really believes he's important, the funny goes away and he becomes Bill O'Reilly, except shorter and Jewish.
Denis LearyDustin Hoffman said this one time, that if he hadn't made it as a film star, he would still be happy as a character actor because he was a character actor because of his face from day one, so he would always work in the theater.
Denis Leary