Speculation that U.S. Senator
Susan Collins was considering running for governor arose during the 2015
Maine Legislative session when Representative
Matt Moonen (D-Portland) introduced a bill to strip the governor (LePage at the time) of the power to appoint replacement U.S. Senators in the event of a vacancy and to instead have a special primary and general election. Moonen denied that he was motivated by Collins's possible candidacy, saying he was interested only in counterbalancing Republican-sponsored bills to change how the
Maine Attorney General and
Maine Secretary of State are chosen. Moonen said Collins had told him speculation about her running for governor was "silly." Collins, who was the
1994 Republican nominee for Governor, told
MPBN News on January 4, 2016, that though she was "baffled" by the rumors about her being interested in running for governor, many had encouraged her to run, and she would not rule it out. In October 2017, Collins said she would not run for governor in 2018. No Republican candidate ruled out challenging the results of a ranked-choice primary in court.
Mary Mayhew called for the immediate repeal of RCV, calling it a "scam" and "probably illegal". The
Maine Republican Party filed a federal lawsuit in U.S. District Court in
Bangor on May 4, 2018, seeking to bar the use of RCV for its own primary on the grounds that requiring the party to use it violates its
First Amendment rights to choose its nominee as it sees fit. U.S. District Court Judge Jon Levy rejected the suit on May 29.
Candidates Nominated • Shawn Moody, businessman and independent candidate for governor in
2010 Eliminated in primary •
Ken Fredette, state house minority leader •
Garrett Mason, state senate majority leader •
Mary Mayhew, former commissioner of the Maine Department of Health and Human Services
Withdrawn • Deril Stubenrod, write-in candidate for the U.S. Senate in
2014 •
Mike Thibodeau, Maine Senate president
Declined •
Rick Bennett, former chairman of the
Maine Republican Party, former
President of the
Maine Senate, candidate for the U.S. Senate in
2012 and nominee for
ME-02 in
1994 •
Susan Collins, U.S. senator and nominee for governor in
1994 • Nick Isgro, Mayor of
Waterville •
Bruce Poliquin, U.S. representative (ran for reelection) • Peter Vigue, businessman
Endorsements Polling Debate Results ==Democratic primary==