Iowa caucus

First presidential contest

The Iowa caucus is a political event in which Iowa voters gather to select delegates for presidential candidates, traditionally the first contest in the U.S. presidential nomination process.

Unlike primaries where voters cast secret ballots, caucuses involve public discussion and sometimes physical grouping by candidate preference.

Iowa's early position gives it outsized influence in winnowing the field: He finished third in the Iowa caucus and dropped out the next week.

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electoral mechanism

Iowa caucusprimary election

Party candidate selection vote

secret ballot · mail-in voting · absentee voting · closed primary · general election

primary calendar position

Iowa caucusSuper Tuesday

Concurrent multi-state primary date

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Iowa, Iowan, Iowans, caucus, caucuses, caucused, caucusing

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