Trump won't be in a three way race like LePage was.
Uh, LePage would have won reelection in 2014 even without Cutler in the race.
In 2014, LePage got about 48% of the vote. Polls still showed him narrowly up in a two way race against Michaud. Also, one cannot assume all the Cutler voters would have voted in a two way race, some may have stayed home, or maybe even voted for LePage.
I believe many of the people who voted for LePage regret their vote. So, baring another Ebola outbreak or something similar happening right before the election, I don't think Maine voters will be fooled a third time.