| Name | Category |
|---|---|
| Public Citizen Litigation Group | Not-classified |
| The Institute for Policy Innovation | Issue and Policy Advocacy |
| Taxpayers Protection Alliance | Issue and Policy Advocacy |
| Association of American Physicians and Surgeons | Health & Medical |
| American National Standards Institute | Charitable & Nonprofit |
| American Vaping Association | Social Welfare |
| Heartland Institute | Issue and Policy Advocacy |
| National Ms Society | Affinity |
| Scitech | Affinity |
| National Kidney Foundation | Affinity |
| Massachusetts Nurses Association | Health & Medical |
| Food And Drug Law Institute | Health & Medical |
| The Brookings Institution | Issue and Policy Advocacy |
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