OK, but here's the NPR link...I'll let the EXPERTS argue this one...
Linguist Geoff Nunberg
Linguist Geoff Nunberg does some of his own checking on liberal bias in the media. Expanded Coverage
Another problem with his research is he expects Cato to be labeled "Conservative," when it's not! It's libertarian! If newspapers are labelling it "conservative," they're making a mistake!
And yet ANOTHER problem with his research is that he might be looking at ALL items in the newspaper, not just hard news articles.
Letters to the editor, columnists, and editorials are free to use terms like "mean-spirited racist Republicans" and "bleeding-heart liberal commie dogs"--we expect the NEWS articles to be unbiased, not the whole newspaper!