Yes, that is precisely what happens. Jon Stewart and Stephen Colbert are always going to be considered funny by 20-somethings as long as they still keep smoking their pot, but just about anything could be considered funny by these types under such circumstances.
Look at how quickly "The Wanda Sykes Show" got canceled by the Fox Network this year. That so-called comic Wanda Sykes just would not let up with all the liberal talking points about health care throughout all of 2009.
Actually, I was disappointed to see Wanda's show get yanked when it did, since I was looking forward to seeing how Wanda was going to struggle making jokes about just how thoroughly and totally the Obama agenda got rejected by the American people when the Democrats all got their clocks cleaned during the November 2010 elections. Maybe even Wanda herself breathed a sigh of relief when the Fox Network itself replaced her unfunny show with repeat episodes of "Fringe" immediately after the November 2010 elections.