A hot button topic for politicos. see liberal media, conservative media, whore media, and so on. To avoid getting downvoted for a subjective writeup, I am going to avoid taking a side here. Instead, I am going to make a suggestion.

Watch C-Span.
for an hour, a day, a week, a month, a year, whatever. I do not care. Just do not watch or read any other news outlet while conducting this experiment.

after you've been watching it for a while, go back to watching any other media outlet. Compare what you see and hear to what you saw and heard on C-Span. Other than the annoying commercials, do you see any kind of bias or favoritism?

If so, then the network is biased in the direction you noted. C-Span, being run nonprofit by a bipartisan congress, its mission is, and it tries its best to be, unbiased. If it were not, one of the parties would pull the plug.

(although, I am told, politics is more than bipolar - libertarians, populists, communists, et cetera arent really represented in congress. yet C-Span seems to do a good job of covering them - the only place I saw the libertarian party convention was on C-Span, and the only 3rd party debates I have ever seen were on C-Span as well.)