2018Final results
2018 election for Massachusetts Senate District 34
Massachusetts State Senate · Massachusetts
Patrick O'Connor (R) won with 50.6% of the vote, defeating Katie L. McBrine (D) by 6.7 points.
Patrick O'ConnorRepublican · winner · incumbent
50.6%42,065
Katie L. McBrineDemocrat
43.9%36,533
Stephen D. GillIndependent
5.4%4,503
83,130 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