Massachusetts has open primaries. Registered unaffiliated voters may choose one party's primary ballot to vote on and will remain unaffiliated for future elections. Voters enrolled with a party must vote in their party’s primary. Click on the Online Voter Application and click on Update Address and/or Party which allows voters to switch parties before or after an election. The deadline to submit a party change before the primary election is 2/24/24 (10 days before primary).