A very interesting UCLA study on media bias finds that most mainstream media do lean to the left. I think this is true, although I cannot help but question a couple of the methodologies. For example, it looks like there is an implicit assumption in the ADA score that every issue has a liberal side and a conservative side, and that they are equally far from the center. Also, I wonder how closely the scores of the media outlets track with their audiences – i.e. do more liberal people use mainstream media for their news?