I think it's a real mistake to throw MSNBC into anything other than the "right-wing" column. Yes, they have Olbermann and Maddow, which are both good, fact-based shows with obvious and upfront ideological viewpoints, but that's overwhelmed by people like Scarborough, Buchannan, Matthews, etc. The presence of Olbermann and Maddow on MSNBC speaks mainly to that they do not want to appear to be as rightward-leaning as they actually are, and to the fact that fact-based programming, regardless of bent, enjoys a real lucrative niche.

BTW, I think people have forgotten what a "liberal" looks like if Olbermann is held up as the extreme of the left wing. Remember, America is in the middle of recovering from one of the most severe ideological swings in recent memory, and so things that previously were center or even slightly right-wing are now seen as being extremely liberal. For instance, Obama's health plan is extremely similar to that proposed by the Republicans in the mid 1990s. Point being, bias can be seen relative to the zeitgeist, from which view MSNBC etc can be seen to attempt to steer conversation rightwards by making issues such as "deficit reduction" more discussed than issues such as "unemployment." Olbermann and Maddow spend much of their time defending their own views, and rarely set the tone of the conversation.