Here are the guys at Media Matters on Charles Krauthammer:

Mr. Krauthammer is, of course, free to voice any political point of view he likes, and he should never draw criticism simply for his professed conservative beliefs. But like so many conservative critics, Krauthammer's work is characterized by sloppy thinking, factually-challenged analysis, and partisan hyperbolae that undermines his credibility as an analyst and pundit.

I find it odd to talk about a pundit's "credibility," but alas.