Spend an hour at the AIM and FAIR web sites, and then ask yourself how each can find evidence of dreaded liberal or conservative bias if the news media is so overwhelmingly one way or the other.
He does see some dangerous structural biases. Well worth a read.
While I tend to see more liberal bias than Cline in the “mainstream” press, I agree with his overall point. Indeed, as I used to tell my students, Media is plural. Remember, Rush Limbaugh is part of “the media,” too.