[2] Incumbents seeking re-election won all major statewide seats: Governor, Attorney General, Secretary of the Commonwealth, Auditor, and Treasurer.

[3] The number of ballots cast, approximately 2.7 million, was the highest ever in Massachusetts for a midterm election.

Incumbent Democratic Secretary of the Commonwealth William F. Galvin ran for re-election to a seventh term in office.

[6] The Republican Party nominated Swampscott resident and security expert Anthony Amore.

[8] Incumbent Democratic attorney general Maura Healey ran for re-election to a second consecutive term.

Incumbent Democratic Treasurer and Receiver-General Deb Goldberg ran for re-election to a second term in office.

[11] Helen Brady, business manager of the Boston Pops and candidate for state representative in 2016, was unopposed for the Republican nomination.

The 3rd District seat was won by Lori Trahan, after incumbent Niki Tsongas did not seek re-election.

[3] The seat gained by the Democrats was in the Norfolk, Bristol and Middlesex district, where challenger Becca Rausch defeated incumbent Richard J. Ross by a two percent margin.