What is the difference between a primary and a caucus?
A primary is a standard secret-ballot election run by the state government. A caucus is a series of local party meetings where participants publicly declare their support and may be persuaded before delegates are allocated.
A primary is conducted like a regular election: voters go to a polling place (or vote by mail) and cast a secret ballot for their preferred candidate. The state government administers the vote. Results are tallied and delegates are awarded based on the percentage each candidate receives.
A caucus is a fundamentally different process. Participants gather in person at a school, library, or community center at a specific time. They publicly group themselves by candidate preference. Organizers count the groups; candidates whose support falls below a viability threshold are eliminated, and their supporters must choose a new group or go home. This process can take hours.
The caucus format has declined significantly in recent decades. Iowa, which held the famous 'first-in-the-nation' caucuses for decades, faced major criticism after its 2020 Democratic caucus was marred by reporting failures. The Democratic National Committee subsequently moved toward primaries for 2024 and beyond.
For 2028, most states are expected to use primaries. The specific states using caucuses will depend on party rules decisions made over the next 12-18 months. The distinction matters because caucuses typically have lower turnout and may favor more ideologically committed voters.
Related questions
Which produces more representative results, a primary or a caucus?
Can a state hold both a primary and a caucus?
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Related explainers
Primary voters choose delegates who will represent them at the party's national convention. The candidate who wins enough delegates - typically a majority - becomes the party's nominee.
In a closed primary, only registered party members may vote. In an open primary, any registered voter - including independents - may participate. Semi-open and semi-closed variations also exist.
A delegate is a person authorized to represent their state at the national party convention and cast a vote toward selecting the presidential nominee. Primary voters are choosing these delegates, not the nominee directly.
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