Read the journalists comments above.
Fox is right wing because it is willfully censors itself. It does this knowing full well. Watch "Outfoxed".
http://www.outfoxed.org/
The other news channels are not so awake to their own censorship. For this, they end up more or less neutral. They censor things because they think that people can't take it, and that they'll get in trouble for it, no matter which side its slanted. I don't mean neutral in a good way, I mean that they take out parts of stories that make their ideology curve to one side or another, thus rendering the story useless just to try to appease everyone.
All news media is unreliable