CalledUnofficial results
South Dakota Legislative District 18
South Dakota House of Representatives · South Dakota
Mike Stevens and John R. Marquardt won the district's 2 seats.
Two representatives per district
Mike StevensRepublican · winner · incumbent
35.6%5,106
John R. MarquardtRepublican · winner
26.9%3,853
Karen SpringerDemocrat
21.1%3,021
Jarod HolcombDemocrat
16.4%2,357
14,337 votes
Source: South Dakota Secretary of State unofficial resultsUpdated Nov 7, 2026, 1:22 PM ET
Where the race moved
Against the 2024 presidential vote
The seat's recent races
Source: Past results: 99chambers results archive (MEDSL, Klarner, state election offices)
Money in this race
Each line compares the two campaigns on one scale.
Karen SpringerMike Stevens
$11.9K
Raised by the campaign
$54.2K
$8.5K
Spent by the campaign
$49.2K
$3.4K
Cash on hand
$34.9K
Other candidates' campaigns: John R. Marquardt $27.9K · Jarod Holcomb $2.2K.
Campaign money: South Dakota Secretary of State, through Oct 20, 2026.
Source: South Dakota Secretary of State campaign filingsUpdated Oct 20, 2026
Pre-election forecast (final, Nov 3)
Our model's last run before Election Day, Nov 3, 2026. It no longer updates.
- Karen Springer
- 1%
- Mike Stevens
- 99%
- Projected margin
- R+18.1