Not at all. At one point there was a website that attempted to mock posts in CU. It was never very successful because they may have disagreed with our politics, but we were nowhere near ridiculous enough to entertain them as DU entertains us.
I invite a liberal to make a "best and worst of CU/CC/FreeRepublic." I imagine that it would entertain us just as much as DU does, I don't think anybody would change what they post.