1968Final results
1968 election for South Dakota Legislative District 25
South Dakota State Senate · South Dakota
R. C. Stenson (D) won with 53.0% of the vote, defeating Harold Sieh (R) by 6.1 points.
R. C. StensonDemocrat · winner · incumbent
53.0%4,600
Harold SiehRepublican
47.0%4,072
8,672 votes
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET
The seat over time
D − R margin in this seat's races around 1968
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET