2010Final results
2010 election for South Dakota Legislative District 20
South Dakota State Senate · South Dakota
Mike Vehle (R) won with 57.3% of the vote, defeating Susan Thie (D) by 35.1 points.
Mike VehleRepublican · winner · incumbent
57.3%4,827
Susan ThieDemocrat
22.2%1,870
Steve SibsonIndependent
20.5%1,729
8,426 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 2010
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET