Partisanship of State Primary Election Systems
State primary elections determine the candidates that will be on the ballot for the general election. States primary election systems vary widely, with some elections only open to voters registered with a particular party, while other states allow non-affiliated voters to participate as well. While most state primary systems are partisan, a few states have adopted nonpartisan primaries, in which voters cast a ballot in a single primary with all candidates on the same ballot. Nonpartisan primary states receive the highest score on our map as evidence suggests these systems increase voter turnout as well as produce more competitive and less polarized elections. Closed primary states receive the lowest score as these systems completely exclude millions of Independent and unaffiliated voters from participating in primary elections. Note: This map tracks systems used for state level and congressional primaries. Some states use different rules for presidential primaries, which are indicated with asterisks on the map. See the citations for additional details.
State primary system is nonpartisan (everyone votes in a single primary)
State primary system is open to Independents (all voters can choose which primary to vote in without registering with a party)
State primary system is closed (voters must be registered with a political party to participate in that primary)
State primary system is semi-open (only independent voters can choose which primary to vote in)
State primary system is semi-closed (state law allows political parties to choose which voters can participate in primaries)
Note: This map tracks systems used for state-level and congressional primaries. Some states use different rules for presidential primaries, which are indicated with asterisks on the map. See the citations for additional details.
*State uses different rules for presidential primaries. Please click “Citations” beneath the map legend for more information.
Recommended citation: Movement Advancement Project. “Partisanship of State Primary Election Systems.” https://www.mapresearch.org/democracy-maps/state_primary_systems. Accessed [date of access].
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- Indicates state law or policy
- Indicates local laws or policies and/or partial law
- Indicates no law or policy
- Enumeration not applicable
- State has law that only covers sexual orientationLaw covers sexual orientation
- State has law that covers sexual orientation and gender identityLaw covers sexual orientation and gender identity/expression
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Law covers association
- Law prevents schools from adding LGBTQ protections
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Law bans transgender students from using school facilities consistent with their gender identity
| State | Anti-bullying | Nondiscrimination | Year Passed |
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| Alabama | |||
| Alaska | |||
| American Samoa | |||
| Arizona | |||
| Arkansas |
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| California |
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| Colorado |
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| Connecticut |
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| Delaware | |||
| District of Columbia |
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| Georgia | 2011 | ||
| Guam |
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| Hawaii |
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| Idaho | |||
| Illinois |
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| Indiana | |||
| Iowa |
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| Kansas | |||
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| Louisiana | |||
| Maine |
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| Maryland |
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| Massachusetts |
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| Michigan |
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| Minnesota |
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| Mississippi | |||
| Missouri | State does not have this law | State does not have this law | 2006 |
| Montana | |||
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| Nevada |
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| New Hampshire |
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| New Jersey |
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| New Mexico |
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| New York |
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| North Carolina |
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| North Dakota | |||
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| Ohio | |||
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| Oregon |
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| Pennsylvania | |||
| Puerto Rico |
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| Rhode Island |
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| South Carolina | |||
| South Dakota | State does not have this law | State does not have this law | 2012 |
| Tennessee | |||
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| U.S. Virgin Islands |
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| Vermont |
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| Virginia |
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| Washington |
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| West Virginia |
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| Wisconsin |
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| Wyoming |

