If you would bother to read their opinions, you could find the sources for the evidence. Newsbusters is good. Other people have made studies on the issue. One wouldn't think that the topic of media bias and liberal social cliques would be much disputed on a conservative website.
I think you are the first person I have ran across that does not take media bias and liberal social circles as a given.
Anyone else out there think that media bias is not interrelated with liberal social circles?