- United States Senate
 - Official site for the U.S. Senate. Contains profiles and contact information for current senators and committees as well as descriptions of legislation, Senate history and tours, and reference materials. - Filibuster (4)
- National Republican Senatorial Committee (NRSC)
- National Republican Senatorial Committee (NRSC) was established by Republican Members of the United States Senate to help Republican candidates develop the campaign resources they need for 2006 to maintain and grow their majority in the United States Senate.
- Senate Republican Policy Committee (RPC)
- Composed of GOP Senate leaders and the chairmen of the Senate's standing committees.
- U.S. Senate Democratic Leadership Committees
- Provides information to Democratic Senators, their staffs, the press and the public.
- U.S. Senate Historical Office
- Presenting the development of the Senate as an institution, biographies of famous senators, interviews, photographs, essays, and special exhibits.
- Wikipedia: United States Senate
- Article about the upper house of the United States Congress. Features a list of members, operation, procedural quirks, and more.
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