2020Flipped from RepublicanFinal resultsIncumbent defeated
2020 election for Massachusetts Senate District 9
Massachusetts State Senate · Massachusetts
John Cronin (D) won with 50.9% of the vote, defeating Dean Tran (R) by 2.0 points, a seat Republicans won last time.
John CroninDemocrat · winner
50.9%42,188
Dean TranRepublican · incumbent
49.0%40,558
82,851 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 10:09 AM ET
The seat over time
D − R margin in this seat's races around 2020
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 10:09 AM ET