Regardless of party, the candidates need to remind those likely to vote for them to register as a Democrat or Republican because of closed primaries.
- Delaware
- Florida
- Kansas: Unaffiliated voters may choose a party the day of the primary, but may not vote in the primary and remain unaffiliated.
- Kentucky
- Maine
- Nevada
- New Jersey: Newly registered voters may choose a party at the polls.
- New Mexico: Parties may choose to hold semi-closed primaries by changing party rules, but as of January 2016, primaries were closed.
- New York
- Pennsylvania
- Wyoming: A voter may change party affiliation on election day. (click here)
