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Member brief · 119th Congress

Sen. Mike Rounds

R · Republican · U.S. Senator, South Dakota1

In Congress
Since 2015 · 11 years
 Next election
Nov 3, 2026
 Committee leadership
Chairman, Cybersecurity
Chairman, Securities, Insurance, and Investment

CommitteesCommission on Security and Cooperation in Europe; Appropriations; Armed Services; Banking, Housing, and Urban Affairs +2 more2

Participation3

99 / 100

Chamber median 98
907 of 915 roll calls

Party unity3

99 / 100

Chamber median 99
on 832 party-line votes

Cross-party agreement3

9 / 100

Chamber median 9
on 885 contested votes

Ideology score4

+0.35

Chamber median +0.32
−1 left · +1 right

Notable votes and votes by issue

In the full brief: five notable recent votes chosen by a fixed rule (most recent breaks with party first), each with the member’s vote, the party’s position and a source, plus how often Rounds votes with the party on each issue.

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Votes most like5

R John Boozman AR 100% of 871
R Alan Armstrong OK 99% of 177
R Pete Ricketts NE 99% of 877

Share of roll calls both voted on where they voted the same way.

Next race

Nov 3, 2026 · On the November ballot7

On the ballot against them

Brian BengsIndependent

Data as of Oct 4, 2026 · votes through Sep 30, 2026 · Method: https://oathstar.com/methodology · Live profile: https://oathstar.com/member/mike-rounds

  1. 1. Member record and terms: congress.gov; unitedstates/congress-legislators, retrieved 2026-10-04. www.congress.gov/member/R000605
  2. 2. Committees: unitedstates/congress-legislators, retrieved 2026-10-04. github.com/unitedstates/congress-legislators
  3. 3. Participation, party unity, cross-party agreement, votes by issue: Oathstar from Voteview roll calls, 119th Congress, retrieved 2026-10-04. voteview.com/person/41505
  4. 4. Ideology: DW-NOMINATE first dimension, Voteview, 119th Congress. voteview.com/person/41505
  5. 5. Votes most like: Oathstar from Voteview roll calls, 119th Congress. voteview.com/data
  6. 6. Candidates: FEC filings, 2026 SD-SENATE race, retrieved 2026-10-05. www.fec.gov/data/elections/senate/SD/2026/
  7. 7. November ballot: https://en.wikipedia.org/wiki/2026_United_States_Senate_elections, as of 2026-10-03. en.wikipedia.org/wiki/2026_United_States_Senate_elections

Prepared with Oathstar · oathstar.com

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