How Presidential Primaries Work: The Race Before the Race
Before a major-party nominee faces the general election, they first have to win their party's nomination. That process — primaries and caucuses held state by state — is arguably the most consequential and least understood part of selecting a US president.
Primaries vs Caucuses
Most states hold primaries, which are essentially elections run by state governments. Voters show up, cast a secret ballot, and leave — much like any election. Caucuses are different: organized by parties rather than states, they are meetings where supporters gather, sometimes debate, and openly group themselves by candidate. Caucuses favor highly motivated, organized voters; primaries favor broad participation. Over the years, most states have abandoned caucuses for primaries in the name of accessibility.
How Delegates Are Allocated
Each state party is assigned a number of delegates based on a mix of population and party loyalty. Primaries allocate them through proportional, winner-take-all, or hybrid rules depending on the party and the state. A candidate needs a simple majority of delegates to win the nomination outright. Falling short means a contested convention, where delegates negotiate on later ballots — something that has become rare in the modern primary era.
Why Iowa and New Hampshire Matter
Iowa and New Hampshire vote first, and their small populations belie their enormous influence. Strong showings there generate media attention, donor interest, and momentum that can carry weaker-funded candidates forward — or end campaigns overnight. Critics argue this system gives two small, mostly rural states outsized power over the national field, and both major parties have repeatedly tried to reorder the calendar.
This article is a neutral civics explainer and does not endorse any candidate, party, or reform proposal.