Chapter 01 / Rankings
The best primary systems 2026, ranked by who gets to vote
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What is the best primary system in 2026?
The best primary system in 2026 is the nonpartisan top-two open primary, because every voter gets the same ballot and every candidate competes on it.
Primary Field Guide ranks the best primary systems 2026 on four tests: who can vote, ballot privacy, how many candidates reach November, and track record. The top-two primary leads because nearly 40 million Californians have voted in one without joining a party since Proposition 14 passed in 2010.
What is a primary system?
A primary system is the set of state rules that decides who may vote to choose the candidates who appear on the general election ballot. In the Primary Field Guide rankings, the key question is simple: does a registered voter need to join a political party to take part? Six main systems answer it differently, from fully nonpartisan ballots to party-members-only contests.
Because over 90 percent of congressional seats are considered safe for one party, the primary is often the real election. That makes the primary system the single rule that most shapes whose vote counts.
The best primary systems 2026, in rank order
Rank 1: Nonpartisan top-two primary
California, Washington
Every registered voter gets the same ballot listing every candidate, no party choice is asked or recorded, and the two leaders advance. California has used it since voters passed Proposition 14 in 2010, so it has the longest statewide record of any fully open system.
Rank 2: Top-four or final-five primary with ranked choice
Alaska
Every voter gets one ballot, and four candidates advance to a ranked choice general election, which widens the November field. It ranks second because it is newer, adopted in 2020, and Alaska’s presidential primary stays closed.
Rank 3: Open primary
19 states, including Michigan, Texas, and Georgia
Any voter can take part without registering with a party, usually choosing one party’s ballot in private. Voters must still pick a single party’s contest, so the field they can choose from is split.
Rank 4: Semi-open primary
Arizona, Colorado, and others
Any voter can request a party ballot, but the choice may be recorded publicly. Access is broad, though privacy is weaker than in a traditional open primary.
Rank 5: Semi-closed primary
10 systems, including Rhode Island and North Carolina
Unaffiliated voters may pick a party ballot, but members of other parties cannot cross over. Some voters may have to affiliate at the polls.
Rank 6: Closed primary
15 states, including New York, Pennsylvania, and Florida
Only enrolled party members vote in each party’s primary, so independents get no primary ballot at all. In New York alone, that excludes 3,187,610 registered voters.
Is the top-two primary right for every state?
For voter access, yes: it is the only system where no voter must pick a party contest. A top-four system fits states that also want more than two November choices. A traditional open primary fits voters who want to keep separate party nominations. The trade-off of top-two is that two candidates from one party can advance.
The numbers behind the ranking
- 40 million
- Californians covered by the top-two primary, the largest fully open primary electorate in the country.
- 66,284,669
- Americans registered in states that will not let them vote in primary elections.
- 63 million
- Registered independent or unaffiliated voters nationwide, 28.9 percent of the electorate.
- 22.1%
- Share of possible 2026 primaries that were contested at all.
More figures are collected in primary elections by the numbers.
How the six primary systems compare
| System | Who can vote | Party choice recorded | Candidates in November | Where used |
|---|---|---|---|---|
| 1. Top-two | Every registered voter | No party choice at all | Top 2, any party | CA, WA |
| 2. Top-four | Every registered voter | No party choice at all | Top 4, ranked choice | AK |
| 3. Open | Every registered voter | Private in most states | One per party | 19 states |
| 4. Semi-open | Every registered voter | May be recorded | One per party | AZ, CO, others |
| 5. Semi-closed | Party members and unaffiliated | Recorded | One per party | 10 systems |
| 6. Closed | Party members only | Enrollment required | One per party | 15 states |
Where each primary system is used in 2026
- Nonpartisan top-two or top-four (3)
- Open or partially open, no party registration (19)
- Partly open: unaffiliated voters may pick a ballot (14)
- Closed: party members only (15)
State groupings follow the Independent Voter Project’s state-by-state primary guide. Semi-open and semi-closed states are combined here as partly open.
Top 10 open primary states
Among the 19 traditional open primary states, these ten have the most to gain from open access, ranked by the share of voters registered or modeled as independent.
- 01Hawaii48.77%
- 02Mississippi47.27%
- 03Arkansas40.45%
- 04Montana29.07%
- 05Georgia28.89%
- 06North Dakota28.4%
- 07Minnesota28.08%
- 08Missouri17.23%
- 09Michigan16.85%
- 10Alabama8.46%
Which states have top-two primaries?
California and Washington have top-two primaries, and Alaska uses a top-four variant. California’s system came from Proposition 14 in 2010, a ballot measure authored by the Independent Voter Project. Nebraska elects its legislature on a nonpartisan ballot.
How to check your own state, step by step
- Find your state on the map above and note its primary system.
- Check your registration with your state election office. In closed states, party deadlines can fall months early; New York’s is February 14 for a June primary.
- If you are independent in a closed or semi-closed state, learn whether you can request a ballot.
- Support open primaries through the Independent Voter Project’s take-action page, then read about More Choice Voting.
Methodology
We ranked the six systems on four criteria: who may vote, whether a party choice is required or recorded, how many candidates reach the general election, and statewide track record. Every entry is judged on the same criteria using published state election rules and the named sources on this page. We did not run our own surveys or polls. Read how we rank primary systems for the full approach.
Common questions
- What is an open primary?
- An open primary is a primary election where any registered voter can take part without joining a political party. In a traditional open primary, the voter privately chooses one party’s ballot on election day. In a nonpartisan open primary, such as California’s top-two, every candidate appears on one ballot that every voter receives.See this answer in the full FAQ
- Which states have open primaries in 2026?
- In 2026, 19 states run open or partially open primaries with no party registration: Alabama, Arkansas, Georgia, Hawaii, Illinois, Indiana, Michigan, Minnesota, Mississippi, Missouri, Montana, North Dakota, Ohio, South Carolina, Tennessee, Texas, Vermont, Virginia, and Wisconsin. California, Washington, and Alaska go further with nonpartisan primaries open to every voter on one ballot.See this answer in the full FAQ
- Which states have top-two primaries?
- California and Washington have top-two primaries, where the two leading candidates advance regardless of party. Alaska uses a related top-four primary with ranked choice voting in November. Nebraska elects its unicameral legislature on a nonpartisan ballot. Louisiana long used a majority-vote jungle system, but current state data lists it under closed primaries.See this answer in the full FAQ
- What is the difference between open and closed primaries?
- The difference is who gets a ballot. In an open primary, any registered voter can participate regardless of party. In a closed primary, only registered party members can vote in that party’s contest, so independents sit out. In New York alone, 3,187,610 registered voters are barred from closed primaries.See this answer in the full FAQ
- Is a top-two primary better than an open primary?
- For voter access, a top-two primary goes further than a traditional open primary, because no voter has to pick a party ballot and every candidate competes on one list. It ranks first in this guide for that reason. A traditional open primary still keeps separate party contests, which some voters prefer.See this answer in the full FAQ
- What should I do first after learning about primary reform?
- Start by supporting open primaries, then explore More Choice Voting. Open primaries fix the first barrier, getting every voter a ballot. More Choice Voting builds on that by widening the field in November. Super PAC limits address a separate issue, money in elections, once access is in place.See this answer in the full FAQ
Your next step
Start with open primaries. Then explore More Choice Voting.
Getting every voter a primary ballot is the first barrier to clear. The Independent Voter Project runs the national campaign for open primaries for every voter, and our More Choice Voting chapter covers what comes after.