Desh, since I know you appreciate blogs I could link you to numerous blogs that show hundreds of examples of the media's liberal bias. As I said your one example is not proof of a trend.
Who had a news monopoly for years? Tom Brokaw, Dan Rather, Peter Jennings, The New York Times and The Washington Post. Any conservatism there?
Why do you think Rush Limbaugh and conservative talk radio has done so well? Because conservatives had no other outlet for their voices.
I can show you a site that tracked Dan Rather for years and the numerous left-leaning comments he would make.
It is obviously your choice to believe what you would like. The evidence over three or four decades clearly shows a liberal bias in the media.