Maine has closed primaries. In presidential, state, and congressional primaries, voters must affiliate with a party to vote in their primary, but unaffiliated voters may affiliate with a party on election day. Affiliated voters wishing to update their affiliation must do so by 2/18/24 (at least 15 days before the election). You can update your affiliation 3 months after the date of your last party change. Online registration is currently not available.