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A December 2004 study by Tim Groseclose and Jeff Milyo funded by UCLA, the University of Missouri, Stanford University, and the University of Chicago, shows that media outlets cite left-leaning think tanks more often than right-wing ones.
They start with Americans for Democratic Action (ADA), a liberal lobbying group, ratings of the voting records of Senators and Representatives. They looked at the ratings of politicians who cited any of 200 prominent think tanks positively and then looked at how various media sources quoted the same sources.
The two Think Tank/Policy Groups cited most frequently were fairly neutral (as measured by the average scores of legislators citing them):