California • Colorado • Connecticut • Delaware
Florida • Georgia • Hawaii • Idaho • Illinois • Indiana
Iowa • Kansas • Kentucky • Louisiana
Maine • Maryland • Massachusetts • Michigan
Minnesota • Mississippi • Missouri
Montana • Nebraska • Nevada • New Hampshire
New Jersey • New Mexico • New York
North Carolina • North Dakota • Ohio • Oklahoma
Oregon • Pennsylvania • Rhode Island • South Carolina
South Dakota • Tennessee • Texas • Utah • Vermont
Virginia • Washington • West Virginia • Wisconsin • Wyoming
Voting in 2013 Primaries • Voting on November 5, 2013
Poll Opening and Closing Times
Absentee voting • Early voting
Open Primary • Closed Primary • Blanket Primary • Online voter registration in the 50 states
In a closed primary, the selection of a party's candidates in an election is limited to registered party members. This prevents members of other parties from "crossing over" to influence the nomination of an opposing party's candidate. 
The closed primary election is to choose a particular party’s candidate who will eventually run for office in the general election.
States that use a closed primary
There are 20 states that use a closed primary process.
Other primary systems
Open primary is a primary election in which any registered voter can vote in any party's primary. Voters choose which primary to vote in, and do not have to be a member of that party in order to vote.
Some states have a mixed primary system, in which some parties allow any registered voter to vote in their primary and other parties restrict their primary to party members.
In a blanket primary, voters pick one candidate for each office without regard to party. The candidates with the most votes advance to the general election. For example, two Democrats or two Republicans can advance beyond the primary to the general election.
- Open primary
- Voting in the 2012 primary_elections
- Primary election
- Signature requirements and deadlines for 2012 state government elections
- Signature requirements and deadlines for 2012 U.S. Congress elections
- Primary election definition from Encyclopedia Britannica
- MTV Rock the Vote Terms and Definitions
- U.S. Legal Definitions
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