Elections · U.S. Senate · South Dakota
2026 South Dakota Senate race
Mike Rounds (Republican) and Brian Bengs (Independent) are on the November 3, 2026 ballot for U.S. Senate in South Dakota, as recorded September 21, 2026 from the South Dakota Secretary of State.
The November ballot
Raised so far, filed with the FEC
Official candidate list: South Dakota Secretary of State. Not a prediction.
The seat
Mike Rounds
Republican · Holds the seat now
First took office 2015 · Age 71
From the member's own disclosures and congress.gov. Not cosponsoring is not a vote against a ban.
How to vote in South Dakota
- General electionNovember 3, 2026
Register 15 days before the election.
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How they won the primary
The primary · 133,625 votes
- Mike Rounds Won: 75.8% 101,284
- Justin McNeal: 24.2% 32,341
Primary results as recorded October 12, 2026, ordered by votes. Source: South Dakota Secretary of State primary canvass and certificate. Certified June 9, 2026. A primary result is a recorded fact about a past contest, not a prediction of November.
The money on this race
- Raised by candidates
- $5.3M
- Outside money
- $1.3M
Outside money, for and against
Independent expenditures; direction is each filer's own declared filing.
Where each candidate's money comes from
Small donors give $200 or less; PACs are political action committees. Shares of each candidate's own receipts on file with the FEC. Outside money is not part of these figures.
Who is spending on this race
The largest groups spending independently here, ranked; open a row for whose race the money went into.
Independent expenditures reported to the FEC; direction is each group's own declared filing.
Not on the November ballot
2 filedPrimary candidates who did not advance, committees still on file, and candidacies that ended. Being here is a filing fact, not a mark against anyone.
How this seat voted last time
R+31 in 2020
- Mike Rounds Won: 65.7%
- Dan Ahlers: 34.3%
420,219 votes for candidates. A past result is a filed fact, not a prediction of November.
Certified returns via MIT Election Data and Science Lab, from the House Clerk's election statistics and state canvasses.
Candidates and financing from the FEC, public domain. Candidate totals are reported to the FEC through June 30, 2026. Outside money is the FEC's processed total of independent expenditures plus the 24- and 48-hour reports filed since each group's latest regular report. It covers each candidate's own campaign: the years since their previous federal election, up to the six their totals cover. Dataset built 2026-10-12. Nothing here is a forecast, a grade, or a ranking of candidates.