The Democratic incumbent held off a comeback bid from former Gov. Paul LePage, who is known for his inflammatory comments about the LGBTQ community, immigrants and race.
Paul LePage, self-described “Trump before there was Trump," appeared to threaten a staffer who approached him.
The former governor known for his racist comments once called himself "Baby Trump."
Twitter users dragged Paul LePage for echoing white supremacist talking points about national popular vote legislation.
In signing off on Democrat Jared Golden's victory, Maine's outgoing Republican governor took one last dig at the state's ranked-choice voting system.
Elections in the state will let voters rank candidates in order of preference instead of choosing just one.
The state's top election official says the governor doesn't need to certify election results anyway.
"Whether we like it or not, this is what our history is," said the Trump-backing Republican.