I believe all media has a bias. It has to as no one is ever completely objective especially where there is something at stake in which they care.
While news media should stick to the facts, it is practically impossible for someone not to insert commentary even if its nonverbal in their expressions, actions and posture in the case of television.
If there is a truly non-biased news media outlet I have yet to see one, and by the way, most people feel the media is slanted toward the left, however I freelance for a newspaper that is run by more conservative folks and they are STILL accused of slanting to the left.
I hope this answers your question in an objective manner