Any candidates who capture a majority outright are winners. But if nobody gains a majority, the lowest vote-getter is dropped, and voters who picked that candidate first have those votes go to their next highest choice. The candidates are all re-ranked until someone emerges with a majority.
Though the measure was successful, it has faced challenges moving forward, with Maine's Supreme Court ruling ranked-choice unconstitutional, and the state legislature voting to put a hold on its implementation.
Residents have until February 5 to enact a "people's veto" that could lead to overturning the hold.
As for Governor Paul LePage:
Mr. LePage did not support of the measure, and has delayed its implementation until 2021, with a provision that it will be automatically repealed if it’s not in line with the state constitution.