On Monday, March 26, 2018, Senate President Mike Thibodeau, Republican, announced his withdrawal as a candidate for governor of Maine, citing the need to focus on his responsibilities at the legislature and his business. Four candidates remain in the Republican primary - House Minority Leader Ken Fredette, Senate Majority Leader Garrett Mason, former Department of Health and Human Services Commissioner Mary Mayhew, and businessman Shawn Moody. Qualifying on the Democratic side are seven candidates - attorney and former Maine National Guard officer Adam Cote, Biddeford Mayor Donna Dion, state Senator Mark Dion, former Speaker of the House Mark Eves, Attorney General Janet Mills, former state Representative Diane Russell, and lobbyist Betsy Sweet. The field for third-party and independent candidates will be finalized upon the upcoming June 1, 2018 filing deadline.