Basically, jon stewarts punchline is when the cameras pan back to his face and whatever weird facial expression he is using to make fun of his material. And haha, everybody laughs at jon stewarts cute/funny face. My point is if john stewart wasnt as good looking, he wouldn't be worshiped as he is now, let alone have a show. Stewart himself admits he hates it when people comment on him being handsome, so take that however you want.
Not to particularly hate on stewart, but when stewart had jim cramer from mad money on his show and then basically told cramer that his show makes him angry, as if OMG JON STEWART DOESNT LIKE HIS SHOW IT MUST BE THE ANTI CHRIST!!! ,,, and subsequently cramers show gets cancelled, I really have to take a stand and say "America, its time to put jon stewarts dick down"
colbert on the other hand is not over rated