1986Flipped from RepublicanFinal resultsIncumbent defeated
1986 election for South Dakota Legislative District 19
South Dakota State Senate · South Dakota
Carrol Allen (D) won with 54.4% of the vote, defeating Donald C. Peterson (R) by 8.8 points, a seat Republicans won last time.
Carrol AllenDemocrat · winner
54.4%4,125
Donald C. PetersonRepublican · incumbent
45.6%3,460
7,585 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 1986
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET