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)
4 states
State primary system is open to Independents (all voters can choose which primary to vote in without registering with a party)
16 states
State primary system is closed (voters must be registered with a political party to participate in that primary)
12 states + D.C.
State primary system is semi-open (only independent voters can choose which primary to vote in)
15 states
State primary system is semi-closed (state law allows political parties to choose which voters can participate in primaries)
3 states

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].

15% of voting-eligible population lives in states that primary system is nonpartisan
30% of voting-eligible population lives in states that primary system is open to Independents
27% of voting-eligible population lives in states that primary system is completely closed to Independents
25% of voting-eligible population lives in states that primary system is semi-open
3% of voting-eligible population lives in states that primary system is semi-closed

key

Key
  • 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
  • Law covers association
  • Law prevents schools from adding LGBTQ protections
  • Law bans transgender students from using school facilities consistent with their gender identity
State Anti-bullying Nondiscrimination Year Passed
  Citations Citations
Alabama
Alaska
American Samoa
Arizona
Arkansas
State has law that covers sexual orientation and gender identity
2011
California
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
Colorado
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
Connecticut
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
2021
Delaware
District of Columbia
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
Florida
Georgia 2011
Guam
State has law that only covers sexual orientation
Hawaii
State has law that covers sexual orientation and gender identity
Idaho
Illinois
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
Indiana
Iowa
State has law that covers sexual orientation and gender identity
State has law that only covers sexual orientation
Kansas
Kentucky
Louisiana
Maine
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
Maryland
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
Massachusetts
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
Michigan
State has law that covers sexual orientation and gender identity
Minnesota
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
Mississippi
Missouri State does not have this law State does not have this law 2006
Montana
Nebraska
Nevada
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
New Hampshire
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
New Jersey
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
New Mexico
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
New York
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
North Carolina
State has law that covers sexual orientation and gender identity
North Dakota
Northern Mariana Islands
Ohio
Oklahoma
Oregon
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
Pennsylvania
Puerto Rico
State has law that covers sexual orientation and gender identity
Rhode Island
State has law that covers sexual orientation and gender identity
South Carolina
South Dakota State does not have this law State does not have this law 2012
Tennessee
Texas
U.S. Virgin Islands
State has law that only covers sexual orientation
Utah
Vermont
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
Virginia
State has law that covers sexual orientation and gender identity
Washington
State has law that covers sexual orientation and gender identity
State has law that covers sexual orientation and gender identity
West Virginia
Wisconsin
State has law that only covers sexual orientation
Wyoming