99chambers

Horizon · our Election Day forecast: polls, plus fundamentals like incumbency, fundraising and past results.

Pulse · polls only: where the races stand today, with no fundamentals and wider uncertainty.

What's the difference?

South Dakota · South Dakota Legislative District 18 · Updated Oct 16, 2026

John R. Marquardt

Republican2 seats

2026 race · South Dakota Legislative District 18

Solid R

2%98%

Solid R

3%97%
● Karen Springer● Mike StevensINCAlso: John R. Marquardt (R), Jarod Holcomb (D)
Full race forecast

Background

Record
No elected office on file.

Links: Candidate list (source)

Opponents in 2026