I've posted about how the American Prospect effectively froze out Brendan Nyhan for posting criticism of the left; but, of course, this kind of policing goes on on both sides. Money quote:

I have to mention that a conservative publishing house which had previously been very enthusiastic about my book "Media Whores" and signed me to a book contract did a 180 and paid me to go away when they learned that I was targeting Bill "Al Qaida has marked me for death!" O'Reilly, Michelle "Fiver" Malkin and a few others in addition to the various left-wing figures on the whores list.

Depressing.

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