Not even Fox is buying it. Ed Gillespie Challenged On Studies Supporting Romney Tax Plan Gillespie: These are very credible sources, and, you know... Wallace: One of them is from a guy who is – is a blog from a guy who was a top advisor to George W. Bush. So these are hardly nonpartisan studies. Gillespie: Look, Chris I think if you look at Harvard and AEI [American Enterprise Institute] and other studies are very credible sources for economic analysis Wallace: You wouldn't say that AEI is a conservative think tank? Gillespie: I would say it is a right-leaning think tank. That doesn't make it not credible. Wallace: It doesn't make it nonpartisan. Gillespie: It does make it nonpartisan. It's not a partisan organization, I can tell you, there are many instances where there have been things AEI came out with and said, I didn't find it to be necessarily to be helpful to the Republican Party. Wallace: Would you say Brookings Institution is nonpartisan? Gillespie: I would say the Brookings Institution is left leaning and nonpartisan.