Who really decides
In one-party districts, the small share of voters who turn out for primaries effectively chooses the officeholder.
In plain English
Before the main election, each party holds its own contest to pick who will represent it on the November ballot.
Example
In many safely partisan congressional districts, the primary effectively decides who will hold the seat — the general election is a formality.
Why it matters
What the term actually changes.
Polarization debate
Because primary electorates lean more ideological, candidates often campaign to the base first and the middle second.
How it works
The mechanics, in practice.
Open vs. closed
Closed primaries restrict voting to registered party members; open primaries let any voter pick a party ballot.
Setting the matchup
Winners from each party advance to the general election — some states instead send the top two finishers regardless of party.
Related guide
How the Electoral College works
The Electoral College is how Americans actually choose the President — not directly by popular vote, but through state-by-state electoral votes that total 538.
Read the guide → Related issue brief
Should states use independent redistricting commissions?
Some states allow independent commissions to draw voting district maps instead of elected politicians. Supporters say it reduces partisan bias. Critics argue it removes accountability from elected representatives.
Read the brief →You’ve learned the term. Now vote.
Should voter ID be required for all federal elections?
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See the full breakdown — by state and political lean