There is plenty more, but you may find this via Wiki worth a look ...
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Self-described as "the first successful attempt at objectively quantifying bias in a range of media outlets and ranking them accordingly,[82] a study by political scientists Tim Groseclose of UCLA and Jeff Milyo of the University of Missouri at Columbia, both of whom have written for conservative think tanks (American Enterprise Institute), advocacy groups (Federalist Society), and periodicals (The American Spectator),[83] was published in December 2005 in the Quarterly Journal of Economics. The study's stated purpose was to document the range of bias among news outlets.[84] The research concluded that of the major 20 news outlets studied "18 scored left of the average U.S. voter, 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, while only the Fox News "Special Report With Brit Hume" and The Washington Times scored right of the average U.S. voter."
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Read carefully though - the way the study was done was questioned by both left and right.
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The study met with criticism from many outlets, including the Wall Street Journal,[85] and Media Matters.[86] Criticisms included:
* Different lengths of time studied per media (CBS News was studied for 12 years while the Wall Street Journal was studied for four months).
* Lack of context in quoting sources (sources quoted were automatically assumed to be supporting the article)
* Lack of balance in sources (Liberal sources such as the NAACP didn't have conservative or counter sources that could add balance)
* Flawed political positions of sources (Sources such as the NRA and RAND corporation were considered "liberal" while sources such as the American Civil Liberties Union were "conservative".)
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