99chambers

Massachusetts State Senate seat · former district

Massachusetts Senate District 9

5 elections since 2012: Democrats won 4, Republicans 1.

2020 election

Nov 3, 2020 · changed party
  1. John Cronin (D) · won50.9%
  2. Dean Tran (R) · incumbent49.0%

Full results →

Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 10:09 AM ET

Every election for this seat

5 races since 2012; the seat changed party 2 times.

YearWinnerRunner-upWon by
2020John Cronin (D)FlipDean Tran (R)2.0
2018Dean Tran (R)FlipSusan A. Chalifouxzephir (D)8.6
2016Jennifer L. Flanagan (D)—Unopposed
2014Jennifer L. Flanagan (D)Richard Bastien (R)20.9
2012Jennifer L. Flanagan (D)—Unopposed

Won by: the winner's lead over the runner-up, in points of the vote. Source: 99chambers results archive (MEDSL, Klarner, state election offices)