Maine Uses Ranked Choice Voting, joint project of the League of Women Voters of Maine and Maine Citizens for Clean Elections
Elections & Voting 2018, League of Women Voters of Maine
Resources for Ranked-choice Voting, Maine Department of Secretary of State
You can also find more information on RCV in Portland from local government and organizations:
FairVote will provide analysis following Maine's June 2018 ranked choice voting primary elections here.
In Portland in 2011, there were only 32 invalid ballots out of 20,212 ballots cast, or 0.16%. Also, the winner of the election, Michael Brennan, earned most first choices and was also the most successful at reaching out to supporters of other candidates and gaining 2nd, 3rd, and 4th choice votes.
More election observations from election observer Dorothy Scheeline.