2018Final results
2018 election for Wisconsin Senate District 27
Wisconsin State Senate · Wisconsin
Jon Erpenbach (D) won with 66.2% of the vote, defeating Casey Helbach (R) by 32.4 points.
Jon ErpenbachDemocrat · winner · incumbent
66.2%64,605
Casey HelbachRepublican
33.8%32,992
97,597 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