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- Passenger Rail Caucus (2006(?)–)
- Patriot Act Reform Caucus (2006(?)–)
- Pell Grant Caucus, The (2006(?)–)
- Physics Caucus, The (2006(?)–)
- Populist Caucus (2009-)
- Ports Caucus, The (2012-)
- Public Broadcasting Caucus (2006(?)–)
- Public Service Caucus (2007-)
Read more about this topic: Caucuses Of The United States Congress