In general terms of the news networks, MSNBC is the left wing channel, Fox News is the right wing channel, and CNN is the center-left to centrist channel.
I tend to watch CNN more than any of these because, as a center-left (politically) kind of person, CNN is the least irritating of the bunch, but I do notice left-wing slant from time-to-time. Curiously, I also occasionally notice right-wing slant.
That being said, individual shows on each network have different flavors. Hannity's show on Fox, for instance, is going to be staunchly right-wing.
For CNN, it's a mixed bag. Anderson Cooper is more center-left. Erin Burnett is more center-right. Piers Morgan is left. They co-sponsored a presidential debate with the Tea Party. IMO, CNN is trying to strike a centrist balance.