2006Flipped from DemocraticFinal results
2006 election for South Dakota Legislative District 21
South Dakota State Senate · South Dakota
Cooper Garnos (R) won with 58.2% of the vote, defeating Mahylen D. Niles (D) by 16.5 points, a seat Democrats won last time.
Cooper GarnosRepublican · winner
58.2%5,022
Mahylen D. NilesDemocrat
41.8%3,600
8,622 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 2006
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET