How can Libs criticize those who watch Fox News while getting most of their news from comedians..Stewart, Mahr?

Why is it that FOX (whose personalities consist of attorneys, academics, executives, and legal experts) is derided by the left, while they consult actors and stand up comedians like Mahr, Stewart, and Colbert for political enlightenment. Are they really in a position to complain about credibility and journalistic integrity? :- /