Glad you asked
Time poll
Fortunately, I believe this is an online poll, and therefore crap.
A more accurate poll on this subject shows about a third of the younger group sees comedy news shows as a major source of news.
Not too comforting.
It's already evident that people will gravitate to an entertaining source of information instead of an accurate one. It's not just Stewart. People who get all their information from Limbaugh are nuts, too. But then, I think people who get all their information from CNN, MSNBC, and Fox are nuts, so there you go.