From Maine Department of the Secretary of State Bureau of Corporations, Elections and Commissions:
NEW 2023 Enrollment Options
A Maine registered voter may enroll in one of the following parties by checking the appropriate box on the Maine Voter Registration Application:
*Democratic
*Green Independent
*Libertarian
*Republican
A voter may enroll in one of the following qualifying parties by checking the “Other Qualifying party” box on the voter registration application and writing in the qualifying party name:
A voter not wishing to join any party should check the “Unenrolled (no party choice)” box on the application.