What Is a Congressional Caucus?
In Congress, the word “caucus” has two distinct meanings. It refers both to the formal party organizations within each chamber and to informal interest-based groups of members who share common legislative goals.
Party caucuses and conferences
The most important caucuses in Congress are the party organizations. Democrats call theirs a “caucus” (the House Democratic Caucus, the Senate Democratic Caucus), while Republicans call theirs a “conference” (the House Republican Conference, the Senate Republican Conference). These are the bodies that elect party leadership, set legislative priorities, and coordinate party strategy.
At the beginning of each Congress, the party caucus or conference meets to elect its leaders, adopt rules, and make committee assignment recommendations. During the session, party caucuses typically meet weekly to discuss upcoming legislation, hear from leadership, and debate strategy. These meetings are private — non-members and media are not permitted.
Congressional member organizations
The second type of caucus is an informal Congressional Member Organization (CMO) — a voluntary group of members who share an interest in a particular issue or constituency. These include the Congressional Black Caucus, the Freedom Caucus, the Republican Study Committee, the Blue Dog Coalition, the Congressional Hispanic Caucus, and hundreds of others focused on topics from artificial intelligence to rural broadband.
CMOs have no formal legislative authority. They cannot introduce bills, hold official hearings, or compel votes. However, influential caucuses like the House Freedom Caucus can wield significant power by coordinating their members’ votes as a bloc, effectively giving a group of 30–40 members the ability to block legislation in a narrowly divided chamber.
Caucus vs. primary
Outside of Congress, the word “caucus” also refers to a method of selecting presidential nominees used by some states. In a caucus state, voters gather in person at precinct-level meetings to debate candidates and cast votes, rather than voting at a polling place as in a primary election. The Iowa caucuses have historically been the first major event of the presidential nominating process.
Last updated: April 2, 2026.