A breakdown of coverage suggests liberals are getting the short end of the stick, but there's less to it than meets the eye.

It's no secret that conservatives love to cry media bias. It's been a central tenet of much conservative thought and punditry for decades that reporters and major media organizations overwhelmingly tend to the left. But liberals are just as happy to turn the charge around, saying that even if reporters tend to vote Democratic, the actual tenor of coverage actually disadvantages progressive politicians.