2008Final results
2008 election for South Dakota Legislative District 20
South Dakota State Senate · South Dakota
Mike Vehle (R) won with 66.9% of the vote, defeating Jack Mortenson (D) by 33.9 points.
Mike VehleRepublican · winner
66.9%6,320
Jack MortensonDemocrat
33.1%3,123
9,443 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 2008
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET