2018Final results
2018 election for Illinois Legislative District 23
Illinois State Senate · Illinois
Thomas E. Cullerton (D) won with 54.9% of the vote, defeating Seth Lewis (R) by 9.7 points.
Thomas E. CullertonDemocrat · winner · incumbent
54.9%39,604
Seth LewisRepublican
45.1%32,582
72,186 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