And The Winner Is

Mike Rounds won re-election to the U.S. Senate from South Dakota, defeating independent Brian Bengs and securing another six-year term in the chamber. With more than 95% of votes counted, Rounds led Bengs 184,571 to 120,484, a margin of 64,087 votes, according to The New York Times, citing the Associated Press as of today, Nov. 4. ​

The Race

Democratic nominee Julian Beaudion withdrew from the general election by September 24, more than five weeks before election day, leaving Bengs as Rounds's only opponent on the ballot.

Rounds had cleared the Republican primary on June 2 with 101,284 votes against Justin McNeal's 32,341, a margin of 68,943 votes.

Money

Rounds raised $5,148,217 against Bengs's $1,855,763, a roughly 2.8-to-1 receipts advantage. Cash on hand told a different story: Rounds held $1,295,543 at the close of his last filing period while Bengs held $69,708, a gap that points in the same direction as receipts.

Outside spending, as reported through the race's Legis1 page, broke sharply by side:

  • All $565,848 in disbursed independent expenditures went to support Rounds; no outside money was disbursed in support of Bengs as of the October 14 coverage cutoff, according to the race record.
  • Defend American Jobs, a super PAC, reported support spending for Rounds in late May 2026, including a $400,332.47 transaction dated May 26.
  • South Dakota Conservative PAC ran multiple disbursements opposing Bengs from September through late October.
  • South Dakota Conservative PAC also made a series of disbursements supporting Rounds beginning in February.

The race's most-documented exchanges centered on campaign finance and outside influence.

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Bengs argued, according to South Dakota Public Broadcasting (September 3), that Rounds had received more than $215,000 from AI and data-center interests and that "the money tells a different story" about whom Rounds represents; that characterization is Bengs's claim and is not established by the race record.

Rounds's campaign, through adviser Rob Skjonsberg, told SDPB the same day that Bengs was "a tool for the Democrat socialists" who would vote as a Democrat's 51st senator; those are the campaign's allegations and are not established by the race record.

South Dakota Conservative PAC ran ads labeling Bengs a Democrat and a "pro-abortion extremist" and juxtaposed him with Joe Biden and Hillary Clinton, according to The Dakota Scout (October 9); Bengs objected to the characterization of his party affiliation. Those are the PAC's ad claims, not findings established by the race record.

The Incumbent's Record

Rounds has served in the Senate since January 6, 2015, giving him approximately 11 years of service as of election day, according to Congress.gov and his official biography.

For the 119th Congress, his announced committee assignments include Appropriations, Armed Services, Banking, Housing, and Urban Affairs, Environment and Public Works, and Veterans' Affairs. On Armed Services, the Senate committee assignments page lists him on the Personnel, Seapower, and Strategic Forces subcommittees; the sources reviewed do not provide complete subcommittee assignments for Appropriations, Environment and Public Works, or Veterans' Affairs, and a Banking subcommittee assignment is not shown.

His 119th Congress legislative activity, as listed on Congress.gov, spans defense, agriculture, veterans, and financial regulation:

  • Sponsored S.5629, a bill to allow veterans to seek a second opinion after receiving care from the Department of Veterans Affairs.
  • Sponsored S.5277, a bill to establish a ranchland program supporting the U.S. cow herd.
  • Sponsored S.5211, a bill requiring a strategy for cyber cooperation in the Indo-Pacific region.
  • Sponsored S.5139, a bill directing the Secretary of Defense to support development of quantum technologies.
  • Cosponsored S.5555, a bill requiring interim remedial actions on PFAS contamination at Defense Department installations.

The Congress.gov listing is not stated to be exhaustive.

Pre-Election Indicators

Cook Political Report rated the race Solid Republican, with its page last updated April 27; Sabato's Crystal Ball and Inside Elections carried the same Solid Republican consensus rating as of November 3, per the race record.

The Kalshi prediction market currently shows Rounds at 100 percent, but the market page also displays post-election vote counts.

The Legis1 consensus polling average, based on 24 polls and dated October 26, 2026, showed Rounds leading Bengs 51.1 percent to 40.8 percent, a margin of 10.3 percentage points; no final published polling average from RealClearPolitics was available for this race.

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