A UCLA study of news coverage in the past 10 years:
More at
http://www.newsroom.ucla.edu/page.asp?RelNum=6664
Of the 20 major media outlets studied, 18 scored left of center, with CBS' "Evening News," The New York Times and the Los Angeles Times ranking second, third and fourth most liberal behind the news pages of The Wall Street Journal.
Only Fox News' "Special Report With Brit Hume" and The Washington Times scored right of the average U.S. voter.