I would argue that most of those celebrities-turned-effective-politician (Franken was not effective long-term, he bowed out for stupid reasons) each had a lot more than face recognition, they were also snakes and scum or narcissists and I just don’t see Stewart in the crowd. He hasn’t expressed desire for politics, he has been an advocate and has been a great orator and journalist in his own way, but he is a different kind of person who wants different things, this means a distinct lack of political capital.