Federal race · 2026
South Dakota U.S. Senate, 2026
General election: November 3, 2026
Money raised
- Mike Rounds (R)$3.8M raised · $1.3M on hand
- Brian Bengs (I)$1.7M raised · $146K on hand
- Julian C Beaudion (D)$248K raised · $696 on hand
- Justin S McNeal (R)$11K raised · $1 on hand
Raised Cash on hand · bars are blue for Democrats, red for Republicans, gray for others
Candidates
| Candidate | Status | Raised | Spent | Cash on hand | Through |
|---|---|---|---|---|---|
| Mike Rounds (R) | General-election nominee | $3,810,748.34 | $4,385,234.49 | $1,295,542.92 | 2026-10-14 |
| Brian Bengs (I) | Running | $1,678,331.53 | $1,532,628.41 | $145,703.12 | 2026-09-30 |
| Julian C Beaudion (D) | Withdrawn | $247,595.86 | $246,900.11 | $695.75 | 2026-09-30 |
| Justin S McNeal (R) | Lost primary | $10,993.13 | $10,991.79 | $1.34 | 2026-09-30 |
1 registered candidate with no financial reports yet
- William Tremeyne Beauford III (Republican) · Registered with the FEC; has not yet raised or spent $5,000
Totals from the FEC candidate summary file, retrieved October 23, 2026. A dated snapshot, not live reporting; each candidate’s FEC page is the official source.
Total spent on this race
$6,703,013.27 = candidates’ own spending $6,137,164.80 + outside spending $565,848.47
| Candidate | Outside spending for | Against | Electioneering and member messages |
|---|---|---|---|
| Mike Rounds | $565,848.47 | $0.00 | $0.00 |
Candidates’ own spending is their committees’ disbursements less transfers to other committees, contributions to others, loan repayments and refunds (FEC committee summary). Outside spending is independent expenditures, electioneering communications and company or union member communications for or against these candidates (FEC totals by candidate from regular reports, retrieved October 24, 2026; the latest 24- and 48-hour notices are not included yet). Party coordinated spending is not split by race and is not included. All the money
Polling and ratings
Race ratings
Recent polls
| Pollster | Dates | Sample | Margin of error | Results |
|---|---|---|---|---|
| Quantus Insights (R) | October 17–19, 2026 | 633 (LV) | ± 4.1% | Mike Rounds 57% · Brian Bengs 37% |
| Public Opinon Strategies (R) | October 12–16, 2026 | 500 (LV) | ±4.4% | Mike Rounds 54% · Brian Bengs 37% |
| Concord Public Opinion Partners (D) | October 6–8, 2026 | 400 (LV) | ±4.9% | Mike Rounds 42% · Brian Bengs 43% |
| Zenith Research | September 24–27, 2026 | 500 (LV) | ±4.4% | Mike Rounds 53% · Brian Bengs 47% |
| Public Policy Polling (D) | September 8–9, 2026 | 629 (RV) | ±3.6% | Mike Rounds 45% · Brian Bengs 42% |
| Lake Research Partners (D) | August 26–30, 2026 | 500 (LV) | ±4.4% | Mike Rounds 44% · Brian Bengs 51% |
Ratings and polls as listed on Wikipedia: 2026 United States Senate election in South Dakota (retrieved October 22, 2026), licensed CC BY-SA 4.0. TerraCivic does not rate races or compute its own average.
TerraCivic shows public filings without scores, grades or judgments about any candidate.
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