1970Final results
1970 election for South Dakota Legislative District 20
South Dakota State Senate · South Dakota
Eldon L. Smith (R) won with 59.2% of the vote, defeating Jacob Mardian (D) by 18.4 points.
Eldon L. SmithRepublican · winner
59.2%4,778
Jacob MardianDemocrat
40.8%3,296
8,074 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