The way the media works these days is that it's a business, rather than a true, unbiased source of information. As a result, there's a strong market for "news" that is directed at a specific crowd. It IS news, but if you take into account opinions expressed by the network rather than the content they cover, and take it as the gospel truth, and/or seriously, well, you're not a very intelligent person. There's some liberal bias on other sources, but the idea that there's a truly "liberal" media in general is retarded. If the media were all biased one way, it couldn't succeed as a business.
Stephen Colbert once said, and may have been right, (and I'd been saying it for years before that), "Reality has a liberal bias."
Just don't take Fox too seriously, they're a business selling a product, like cigarettes, alcohol, or porn.