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| Heritage Foundation | conservative |
| American Enterprise Institute | conservative |
| Center for Strategic and International Studies | conservative |
| Hudson Institute | conservative |
| Hoover Institution | conservative |
| Progress and Freedom Foundation | conservative |
| Manhattan Institute | conservative |
| Competitive Enterprise Institute | conservative |
| International Institute for Strategic Studies | conservative |
| Family Research Council | conservative |
| National Center for Policy Analysis | conservative |
| Lexington Institute | conservative |
| Discovery Institute | conservative |
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| Reason Foundation | libertarian / conservative |
| Cato Institute | libertarian / conservative |
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| Washington Institute for Near East Policy | center-right |
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| Brookings Institution | centrist |
| Carnegie Endowment | centrist |
| Institute for International Economics | centrist |
| New America Foundation | centrist |
| Aspen Institute | centrist |
| Milken Institute | centrist |
| National Bureau of Economic Research | centrist |
| Council on Foreign Relations | centrist |
| Freedom Forum | centrist |
| Economic Strategy Institute | centrist |
| Progressive Policy Institute | centrist |
| Public Policy Institute of California | centrist |
| New America Foundation | centrist |
| Inter-American Dialogue | centrist |
| Kaiser Family Foundataion | centrist |
| RAND Corporation | centrist |
| Asia Society | centrist |
| Center for Politics | centrist |
| Employee Benefit Research Institute | centrist |
| Woodrow Wilson International Center for Scholars | centrist |
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| Urban Institute | center-left |
| Center for American Progress | center-left |
| Carter Center | center-left |
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| Citizens for Tax Justice | progressive |
| Justice Policy Institute | progressive |
| Center on Budget and Policy Priorities | progressive |
| Center for Public Integrity | progressive |
| Joint Center for Political and Economic Studies | progressive |
| Worldwatch Institute | progressive |
| Center for Defense Information | progressive |
| Institute for Policy Studies | progressive |
| Economic Policy Institute | progressive |
| Center for Economic and Policy Research | progressive |