1970Flipped from RepublicanFinal resultsIncumbent defeated
1970 election for South Dakota Legislative District 12
South Dakota State Senate · South Dakota
Robert T. Collingwood (D) won with 50.5% of the vote, defeating Wendell Leafstedt (R) by 1.0 points, a seat Republicans won last time.
Robert T. CollingwoodDemocrat · winner
50.5%3,914
Wendell LeafstedtRepublican · incumbent
49.5%3,840
7,754 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