1980Final results
1980 election for South Dakota Legislative District 13
South Dakota State Senate · South Dakota
Eugene R. Mahan (D) won with 67.2% of the vote, defeating Richard W. Stene (R) by 34.4 points.
Eugene R. MahanDemocrat · winner · incumbent
67.2%6,315
Richard W. SteneRepublican
32.8%3,084
9,399 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 1980
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET