MSNBC is completely in the tank for Obama - no doubt.
FOX news/radio is completely in the tank for anti-Obama. We know this. you listen to hannity's radio show and it's actually audio clips liek "The official Defeat obama 2012 radio show" - really, they have this, I know youve heard it.
CNN is boring as ass, caters too much to bullshit celeb stories, but yeah, when it comes to politics, they're a distant 3rd to msnbc and fox. And being third, they have the least amount of political coverage, and thus bias. CNN doesnt cover enough politics to really be biased. and have you seen them roast dems? lol weiner was DESTROYED by CNN way worse than by FOX.