1974Flipped from RepublicanFinal resultsIncumbent defeated
1974 election for South Dakota Legislative District 18
South Dakota State Senate · South Dakota
Philip Testerman (D) won with 50.6% of the vote, defeating Robert Miller (R) by 1.3 points, a seat Republicans won last time.
Philip TestermanDemocrat · winner
50.6%4,526
Robert MillerRepublican · incumbent
49.4%4,414
8,940 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 1974
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET