1978Final results
1978 election for South Dakota Legislative District 18
South Dakota State Senate · South Dakota
Philip Testerman (D) won with 57.1% of the vote, defeating Robert Miller (R) by 14.2 points.
Philip TestermanDemocrat · winner · incumbent
57.1%4,664
Robert MillerRepublican
42.9%3,505
8,169 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 1978
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET