I'm not sure how to describe Democratic Underground. Cesspool comes readily to mind. Hate--Overriding hate. That also comes to mind as a descriptor.
Go there and look at the comments on posts. It really defies comprehension. Hatred reigns supreme under the guise of presumed moral and intellectual superiority.
Lest you have any doubts, check out their "Hate Mailbag". While there may be a real email or two thrown in there, it's pretty obvious that the emails are largely contrived. There is just no way that so many dumbasses could email a moderated page (which removes all postings favorable to the administration and bans the authors) in a short period of time. It's clearly fiction written up to make conservatives (particularly the so-called "religious right") look bad. And given the habituates of that page, I imagine they eat it up.