The difference is that more people take Bill O'Reilly seriously, and O'Reilly (along with Hannity and Limbaugh and the even worse Coulter) want to be taken seriously. Colbert is intentional satire. And yes, The Daily Show and especially Colbert Report have their own biases, and I disagree with them on certain things, but they're at least funny about it. John Stewart is not the O'Reilly of the left -- that's Keith Olbermann, who I already said I also can't stand.