1978Final resultsIncumbent defeated
1978 election for South Dakota Legislative District 9
South Dakota House of Representatives · South Dakota
2 seats: Clyde E. Streff (R), John V. Terveen (R) won.
2 seatsClyde E. StreffRepublican · winner
27.3%4,353
John V. TerveenRepublican · winner
25.9%4,129
Duaine SwensonDemocrat · incumbent
25.7%4,098
H. KochDemocrat
21.2%3,377
15,957 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 1978
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET