1970Flipped from DemocraticFinal results
1970 election for South Dakota Legislative District 18
South Dakota State Senate · South Dakota
Robert Miller (R) won with 53.8% of the vote, defeating Harold G. Adams (D) by 7.5 points, a seat Democrats won last time.
Robert MillerRepublican · winner
53.8%3,398
Harold G. AdamsDemocrat
46.2%2,923
6,321 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 1970
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET