In this article, Senator Kerry is complaining about the right wing media. There are some other examples (Alter's What media bias?), that purport to show that the MSM is really a propaganda organ for the right, wealthy whites.
I would propose that you can make a systematic evaluation of any media to determine whether or not bias exists.
First, look for articles that describe Democrats and Republicans. Which has the unnecessary adjectives - "Radical, Liberal, right or left wing. Count up the number and see if there is parity between the two parties.
Next, look for articles that describe a politician doing something wrong. My bet is that in more than 90% of the cases, that if the politician is a Republican, you will be told that in the first three paragraphs, and a 75% chance that it is in the first paragraph. Now if you checked the same politician doing the same thing who is a Democrat, I bet that the earliest you would find their political affiliation would be in the 4th paragraph.
Columbia School of Journalism - where are you to test my theory? Oh yeah, they already have their minds made up.