2012Final results
2012 election for South Dakota Legislative District 12
South Dakota State Senate · South Dakota
Mark Johnston (R) won with 56.3% of the vote, defeating Kent Alberty (D) by 12.5 points.
Mark JohnstonRepublican · winner · incumbent
56.3%5,902
Kent AlbertyDemocrat
43.7%4,588
10,490 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 2012
Races before and after
Source: Harvard Dataverse / Carl KlarnerUpdated Sep 30, 2026, 7:29 AM ET