Bill Maher is a polarizing figure. You either love him or you hate him or you agree with his general stance on things but still find to be to kind of a prick. Fair. On his show last week he criticized The Rally to Restore Sanity/ or Fear, saying "If you're going to have a rally where hundreds of thousands of people show up, you may as well make it about something."
Way to be a soapbox-stander, Maher! But he is right that, while it's nice to point out fault on both sides, that doesn't make them equal. Keith Olbermann isn't the left's equivalent of Glenn Beck.
More than anything, this shows the difference between Colbert and Stewart and Maher. (That and the ratings.) If Maher held a rally, it would look very different than the one Jon and Stephen held. There'd be less Cat Stevens and more yelling, for one. Maher just doesn't seem to want to accept that they have different, less angry sensibilities. And even if you disagree that Stewart is any less vitriolic than Maher, we can all agree it would have been a really weird, awful choice to throw a Republic barn-burner at the National Mall with 200,000 people.