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Although think tanks are usually officially non-partisan (to maintain their 501(c)3 status), most interested observers agree that think tanks often have a fairly consistent set of political leanings. These ratings are included to give you some idea of the political leanings typically assocated with some major think tanks.
Some Major Think Tanks and Their Political Orientations
Reproduced from the CQ Press Guide to Interest Groups and Lobbying in the United States - ed. Burdett A. Loomis (2012)
Added text is italicized
| Think Tank | Political Orientation |
| American Enterprise Institute | Conservative or Center-Right |
| Aspen Institute | Centrist |
| Brookings Institution | Centrist (left-leaning) |
| Carnegie Endowment for International Peace | Centrist |
| Carter Center | Progressive or Center-Left |
| Cato Institute | Conservative or Center-Right (libertarian) |
| Center for American Progress | Progressive or Center-Left |
| Center for Economic and Policy Research | Progressive or Center-Left |
| Center for Politics | Centrist |
| Center for Strategic and International Studies | Conservative or Center-Right |
| Center on Budget and Policy Priorities | Progressive or Center-Left |
| Council on Foreign Relations | Centrist |
| Economic Policy Institute | Progressive or Center-Left |
| Heritage Foundation | Conservative or Center-Right |
| Hoover Institution | Conservative or Center-Right |
| Institute for International Economics | Centrist |
| Inter-American Dialogue | Centrist |
| Joint Center for Political and Economic Studies | Progressive or Center-Left |
| Kaiser Family Foundation | Centrist |
| Lexington Institute | Conservative or Center-Right |
| Manhattan Institute | Conservative or Center-Right |
| New America Foundation | Centrist |
| Public Policy Institute of California | Centrist |
| RAND Corporation | Centrist |
| Urban Institute | Progressive or Center-Left |