2020Final results
2020 election for South Dakota Legislative District 26
South Dakota State Senate · South Dakota
Troy Heinert (D) won with 52.8% of the vote, defeating Joel Koskan (R) by 5.7 points.
Troy HeinertDemocrat · winner · incumbent
52.8%4,416
Joel KoskanRepublican
47.2%3,941
8,357 votes
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 10:09 AM ET
The seat over time
D − R margin in this seat's races around 2020
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 1, 2026, 10:09 AM ET