2018Final results
2018 election for Connecticut Senate District 4
Connecticut State Senate · Connecticut
Steve Cassano (D) won with 54.2% of the vote, defeating Mark Tweedie (R) by 8.5 points.
Steve CassanoDemocrat · winner · incumbent
54.2%23,257
Mark TweedieRepublican
45.8%19,632
42,889 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