The Massachusetts Democratic Party (MassDems) is the affiliate of the Democratic Party in Massachusetts. It is chaired by Steve Kerrigan and is the dominant party in the state, controlling all nine of the state's U.S. House seats, both U.S. Senate seats, all six elected statewide offices including the governorship, and supermajorities in both houses of the state legislature.

The governor of the Commonwealth of Massachusetts is the chief executive officer of the government of Massachusetts. The governor is the head of the state cabinet and the commander-in-chief of the commonwealth's military forces.