2018Final results
2018 election for South Dakota Legislative District 12
South Dakota House of Representatives · South Dakota
2 seats: Arch Beal (R), Manny Steele (R) won.
2 seatsArch BealRepublican · winner · incumbent
26.9%4,757
Manny SteeleRepublican · winner
26.6%4,713
Scott C. PetersenDemocrat
24.4%4,320
Jeff HaywardDemocrat
22.1%3,916
17,706 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