AUGUSTA, Maine (AP)   Supporters say they have enough signatures to force Maine to ultimately become the first state to implement a ranked voting system for primaries and federal elections.

Democratic Secretary of State Matt Dunlap has 30 days to determine whether at least 61,123 of over 80,000 collected signatures are valid. Dunlap has cautioned it would take significant planning and hundreds of thousands of dollars to implement a new system allowing voters rank candidates in order of preference.

Maine became the first to adopt the election overhaul with a 2016 statewide vote. But lawmakers ended up delaying the system after the state supreme court raised constitutional concerns.

Supporters said ranked-choice voting would promote civility among two dozen gubernatorial candidates.

But roll-out of the new system this year will likely face legal challenges.