2018Flipped from DemocraticFinal results
2018 election for Massachusetts Senate District 9
Massachusetts State Senate · Massachusetts
Dean Tran (R) won with 54.3% of the vote, defeating Susan A. Chalifouxzephir (D) by 8.6 points, a seat Democrats won last time.
Dean TranRepublican · winner
54.3%33,199
Susan A. ChalifouxzephirDemocrat
45.7%27,935
61,163 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET
The seat over time
D − R margin in this seat's races around 2018
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 6:17 AM ET