2022Final resultsIncumbent defeated
2022 election for South Dakota Legislative District 18
South Dakota House of Representatives · South Dakota
2 seats: Mike Stevens (R), Julie Auch (R) won.
2 seatsMike StevensRepublican · winner · incumbent
32.1%5,228
Julie AuchRepublican · winner
28.6%4,664
Ryan CwachDemocrat · incumbent
27.7%4,509
Jay WilliamsDemocrat
11.6%1,895
16,296 votes
Source: MIT Election Data and Science LabUpdated Oct 2, 2026, 5:14 AM ET
The seat over time
D − R margin in this seat's races around 2022
Races before and after
Source: MIT Election Data and Science LabUpdated Oct 2, 2026, 5:14 AM ET