Races · Senate · 2026 · South Dakota · general · Republican primary

Republican primary · June 2, 2026

South Dakota Senate Republican primary

Mike Rounds won the Republican primary on June 2, 2026, advancing to the general election on November 3, 2026.

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Primary passed· 4 polls

Where this race stands

Verified

Showing the Republican primary view. General-election ratings, forecasts, and tipping-point odds aren't meaningful for a single-party primary — switch to the general election view for those.

Primary result · Republican primary

Official outcome · June 2, 2026 · forecast shown for reference

1Mike RoundsMarion Michael Rounds (born October 24, 1954) is an American businessman and politician serving as the junior United States senator from Sou…70.1%✓ Won

2Kristi Noem45.7%

3Dusty Johnson19.9%

4Justin McNeal15.6%

Polling average

POLL DOTSCI BAND
40455055606570ROUNDS 48.0JUL '25DEC '25MAY '26
Weighted, plus each pollster's measured bias subtracted before averaging.

All polls · 4 results

strongpositiveinfocautionflag

Date	Pollster · trust signals	n · pop	Rounds	Lead
Apr 19, 26	Mason-Dixon	500 · RV	66	—
Apr 10, 26	Mason-Dixon Polling & Strategy	500 · RV	66	—
Jun 11, 23	Kaplan Strategies	500 · RV	26	—
Jun 11, 23	Kaplan Strategies	500 · RV	—	—