Surprise! Fox News is Fair and Balanced!

Accusations of media bias are common but are typically based upon nothing more than subjective standards and anecdote. A brilliant new paper by Tim Groseclose (GSB Stanford, currently visiting GMU) and Jeff Milyo (U. Chicago, Harris School) pioneers a more promising approach. Since 1947, the interest group Americans for Democratic Action (ADA) has tracked how Senators and Represenatives vote on key issues and they have used these votes to rank politicians according to their liberalism. In the 2002 session, for example Ted Kennedy received an ADA score of 100 and Phil Gramm a score of 0. Political scientists are familiar with ADA scores and have come to rely on them as a measure of ideology.

Groseclose and Milyo have found a way to compute ADA scores for media outlets as if they were politicians. What they did was to examine the Congressional Record for every instance in which a politician cited a think tank. They then did the same thing for newspapers, network news shows and other media outlets. By matching newspapers with politicians who had similar citation records they can impute an ADA score for the media outlet. Joe Lieberman, for example, has an ADA score of 66.3. Suppose that in his speeches he cites the Brookings Institution twice as much as the Heritage Institute. If the New York Times has a similar citation style then the New York Times is assigned an ADA score of 66.3. (The method is slightly more complicated than this but this gives the right idea.) Note that Groseclose and Milyo do not have to determine whether the Brookings Institution is more liberal than the Heritage Institute all they need to know is that the Times has a similar citation style to Lieberman.

Ok, what were the results? It turns out that all of the major media outlets, with the exception of Fox News: Special Report are considerably more liberal than the median member of the House over the 1993-1999 period. Moreover, although Fox News: Special Report was to the right of the median house member it was closer to the median member than were most of the other media outlets. (Interestingly, all of the liberal media outlets were less liberal than the average Democrat and Fox News is less conservative than the average Republican - thus there is a sense in which all media outlets are less biased than is the typical politician.) Here are the ADA scores of various media outlets along with some comparable politicians.

Joe Lieberman (D-Ct.) 66.3
New York Times 64.6
CBS Evening News 64.5
USA Today 62.6
NBC Nightly News 62.5
Los Angeles Times 58.4
Ernst Hollings (D-SC) 56.1
ABC World News Tonight 54.8
Drudge Report 44.1
Arlen Spector (R-PA) 44.0
House Median 39.0
Senate Median 36.9
Olympia Snowe (R-Me) 36.0
Charlie Stenholm (D-Tex) 29.3
Fox News Special Report 26.4