Maine, and half the other states, let a candidate who petitions onto the November ballot choose any short partisan label that does not mimic the name of a qualified party. On May 18, the Maine House defeated LD 568. It would have eliminated the ability of such candidates to have any label on the ballot except “unenrolled”. The vote was 71 in favor of the bill and 76 against.
This probably has to do with former governor candidate Cutler going forward with a loose ideological group to run outside major party system for legislative seats and governorship, the unenrolled label is to make them ugly on the ballot.