| Organization | Description |
|---|---|
| Cato Institute | Washington, D.C. |
| Competitive Enterprises Institute | Washington, D.C. |
| Heartland Institute | Chicago, IL |
| Heritage Foundation | Washington, D.C. |
| Independent Institute | Oakland. CA |
| Manhattan Institute | New York, NY |
| National Center for Policy Analysis | Dallas, TX and Washington, D.C. |
| Reason Foundation | Los Angeles, CA |