Public domain
RepublicanRunning for SD U.S. Senate · 2026
Mike Rounds
Marion Michael Rounds (born October 24, 1954) is an American businessman and politician serving as the junior United States senator from South Dakota since 2015. A member of the Republican Party , he served as the 31st governor of South Dakota from 2003 to 2011.
Born 1954 · Huron, South Dakota , U.S.
In brief
AI · verified vs data · 2026-07-03
Mike Rounds, a Republican who has served as a U.S. senator from South Dakota since 2015 and previously as the state's governor from 2003 to 2011, won his primary and is running for the U.S. Senate seat in South Dakota. He leads opponent Julian Beaudion in polling, about 48% to roughly 24%, and prediction markets put his win probability at around 100%. His campaign has raised roughly $3 million.
48%
Polling average
our aggregate
96%
Win probability
market-implied
$2.6M
Raised this cycle
FEC · committee
Independence scorecard
Computed · FEC money mixWho Rounds's money comes from.
D
24/100
Independence index
Funding mix leans on concentrated money — pac independence is the weak spot.
3 watch items · pac independence
Small-dollar reliance2
1% of individual + PAC money from donors under $200
PAC independence0
50% of individual + PAC money from PACs
In-state funding10
90% of itemized receipts come from out of state
Outside-money exposure82
$566k in outside spending supports the campaign
MONEY-MIX INDEX, COMPUTED FROM FEC FILINGS ONLY: SMALL-DOLLAR SHARE, PAC RELIANCE, IN-STATE MONEY AND OUTSIDE (IE) SPENDING. IT DOES NOT SCORE VOTES OR DONOR–VOTE ALIGNMENT. HIGHER = MORE INDEPENDENT · GREEN ≥70 · AMBER 50–69 · RED <50.
Governing & voting record
What Rounds did in office.
MeasureYearAction
A bill to designate the facility of the United States Postal Service located at 320 South 2nd Avenue in Sioux
Became Public Law No: 118-132.
2023
Became law
A bill to designate the facility of the United States Postal Service located at 410 Dakota Avenue South in Hur
Became Public Law No: 118-135.
2023
Became law
RESPECT Act
Became Public Law No: 117-317.
2021
Became law
A bill to amend title 18, United States Code, to prohibit dismemberment abortions, and for other purposes.
Read twice and referred to the Committee on the Judiciary.
2026
Sponsored
Dakota Mainstem Water Supply Project Feasibility Study Act
Committee on Energy and Natural Resources. Ordered to be reported with an amendment in the nature of a substitute favorably.
2026
Sponsored
Stop Stealing our Chips Act
Held at the desk.
2025
Sponsored
Small Business Investor Capital Access Act
Read twice and referred to the Committee on Banking, Housing, and Urban Affairs.
2026
Sponsored
SPONSORED LEGISLATION VIA CONGRESS.GOV · ENACTED BILLS FIRST, THEN THE MOST RECENT · ROLE SHOWS THE BILL'S LATEST STATUS.
Where they stand
—
Key positions not yet compiled
Positions are drawn from the candidate's public record and statements. We haven't compiled a verified set for this candidate yet.
How Rounds votes
With the party, against it, and where on the spectrum.
Ideological placement · roll-call record
Dem median
GOP median
Rounds
← LiberalCenterConservative →
Center-right
Overall lean
68
DW-NOMINATE · 0–100
DW-NOMINATE FIRST-DIMENSION SCORE FROM ROLL-CALL VOTES IN THE 119TH CONGRESS (SENATE), VIA VOTEVIEW. 0 = MOST LIBERAL, 100 = MOST CONSERVATIVE.
Party unity · 843 roll-calls · 119th Congress (Senate)
99%voted with Republicans · 1% broke ranks
Ratings from advocacy groups
—
No advocacy-group ratings
Interest-group scorecards have no machine-readable feed — they're curated per candidate, and none are on file yet.
Career & history
1991Member of the State Senate of South Dakota
1991–2001
1995Majority leader
1995–2000
2003Governor of South Dakota
2003–2011
2015United States senator
since 2015
Public favorability
—
No favorability data
This candidate isn't tracked by YouGov's public-figure panel, and no published state polling on their favorability was found.
Donors & money
FEC itemized filings · cycle-to-dateWho funds the campaign.
$2.6M
Raised
$1.9M
Spent
$2.7M
Cash on hand
Source of funds · individual + PAC
1% small (<$200)49% large indiv.50% PAC
10% in-state · 90% out-of-state (itemized)
Top contributors · bundled by employer / org
GOOGLE
$42k
MARQUIS MANAGEMENT, INC.
$30k
SANFORD HEALTH
$19k
BUSINESS OWNER
$14k
STARKEY LABS
$14k
ANDREESSEN HOROWITZ (A16Z)
$14k
Top industries · itemized $
Internet$49k
OWN-COMMITTEE TOTALS FROM FEC FILINGS THROUGH 2026-05-13 · INDUSTRY GROUPS ARE ITEMIZED RECEIPTS CLASSIFIED BY EMPLOYER — A KEYWORD APPROXIMATION, NOT OPENSECRETS CODING. SOURCE: FEC ↗
Race
The contest Rounds is running in.
SD · SENATE · 2026safe r
Rounds (R) vs Julian Beaudion (D)
48%+23.9 Rounds24%
Open full race detail →
Related prediction markets
All markets →Live contract prices tied to Rounds and the seat. Prices are ¢-per-share of the YES outcome; context only, never merged into our polling averages.
Will the Republicans win the South Dakota Senate race in 2026?
Polymarket · Republican
Will the Democrats win the South Dakota Senate race in 2026?
Polymarket · Democrat
Which party will win the 2026 US Senate election in South Dakota?
predictit · Republican Party
Which party will win the 2026 US Senate election in South Dakota?
predictit · Democratic Party
South Dakota Senate winner?
Kalshi · Mike Rounds
South Dakota Senate winner?
Kalshi · vol $1 · Julian Beaudion
Sources & provenance
Biography
Public record
Wikipedia + state records
Money & donors
FEC filings
itemized + committee totals
Markets
Live venues
Polymarket · Kalshi
ALL FIGURES DRAWN FROM PUBLICLY AVAILABLE RECORDS · CANDIDATE PROFILES ARE NONPARTISAN AND CARRY NO ENDORSEMENT. · PHOTO: UNITED STATES CONGRESS · PUBLIC DOMAIN (WIKIMEDIA COMMONS)
Related coverage
Republican · SD U.S. Senate
Mike Rounds
Marion Michael Rounds (born October 24, 1954) is an American businessman and politician serving as the junior United States senator from South Dakota since 2015. A member of the Republican Party , he served as the 31st governor of South Dakota from 2003 to 2011.
Where Rounds standsRace →
Rounds 48%Julian Beaudion 24%
Market · wins
96¢
48%
Poll avg
96%
Win prob
$2.6M
Raised
In brief
AI · verified vs data · 2026-07-03Mike Rounds, a Republican who has served as a U.S. senator from South Dakota since 2015 and previously as the state's governor from 2003 to 2011, won his primary and is running for the U.S. Senate seat in South Dakota. He leads opponent Julian Beaudion in polling, about 48% to roughly 24%, and prediction markets put his win probability at around 100%. His campaign has raised roughly $3 million.
Governing & voting record
A bill to designate the facility of the United States Postal Service located at 320 South 2nd Avenue in Sioux
2023 · BECAME LAW
A bill to designate the facility of the United States Postal Service located at 410 Dakota Avenue South in Hur
2023 · BECAME LAW
RESPECT Act
2021 · BECAME LAW
A bill to amend title 18, United States Code, to prohibit dismemberment abortions, and for other purposes.
2026 · SPONSORED
Dakota Mainstem Water Supply Project Feasibility Study Act
2026 · SPONSORED
Stop Stealing our Chips Act
2025 · SPONSORED
Small Business Investor Capital Access Act
2026 · SPONSORED
Where they stand
—
Key positions not yet compiled
Positions are drawn from the candidate's public record and statements. We haven't compiled a verified set for this candidate yet.
Career & history
1991Member of the State Senate of South Dakota
1991–2001
1995Majority leader
1995–2000
2003Governor of South Dakota
2003–2011
2015United States senator
since 2015
Public favorability
—
No favorability data
This candidate isn't tracked by YouGov's public-figure panel, and no published state polling on their favorability was found.
Independence scorecard
Who Rounds's money comes from.
D
24/100
Independence index
Funding mix leans on concentrated money — pac independence is the weak spot.
3 watch items · pac independence
Small-dollar reliance2
1% of individual + PAC money from donors under $200
PAC independence0
50% of individual + PAC money from PACs
In-state funding10
90% of itemized receipts come from out of state
Outside-money exposure82
$566k in outside spending supports the campaign
MONEY-MIX INDEX, COMPUTED FROM FEC FILINGS ONLY: SMALL-DOLLAR SHARE, PAC RELIANCE, IN-STATE MONEY AND OUTSIDE (IE) SPENDING. IT DOES NOT SCORE VOTES OR DONOR–VOTE ALIGNMENT. HIGHER = MORE INDEPENDENT · GREEN ≥70 · AMBER 50–69 · RED <50.
How Rounds votes
Ideological placement · roll-call record
Dem median
GOP median
Rounds
← LiberalCenterConservative →
Center-right
Overall lean
68
DW-NOMINATE · 0–100
DW-NOMINATE FIRST-DIMENSION SCORE FROM ROLL-CALL VOTES IN THE 119TH CONGRESS (SENATE), VIA VOTEVIEW. 0 = MOST LIBERAL, 100 = MOST CONSERVATIVE.
Party unity · 843 roll-calls · 119th Congress (Senate)
99%voted with Republicans · 1% broke ranks
Ratings from advocacy groups
—
No advocacy-group ratings
Interest-group scorecards have no machine-readable feed — they're curated per candidate, and none are on file yet.
Donors & money
$2.6M
Raised
$1.9M
Spent
$2.7M
Cash on hand
Source of funds · individual + PAC
1% small (<$200)49% large indiv.50% PAC
10% in-state · 90% out-of-state (itemized)
Top industries · itemized $
Internet$49k
OWN-COMMITTEE TOTALS FROM FEC FILINGS THROUGH 2026-05-13 · INDUSTRY GROUPS ARE ITEMIZED RECEIPTS CLASSIFIED BY EMPLOYER — A KEYWORD APPROXIMATION, NOT OPENSECRETS CODING. SOURCE: FEC ↗
Race
SD · SENATE · 2026safe r
Rounds (R) vs Julian Beaudion (D)
48%+23.9 Rounds24%
Open full race detail →
Related prediction markets
All markets →Will the Republicans win the South Dakota Senate race in 2026?
Polymarket · Republican
Will the Democrats win the South Dakota Senate race in 2026?
Polymarket · Democrat
Which party will win the 2026 US Senate election in South Dakota?
predictit · Republican Party
Which party will win the 2026 US Senate election in South Dakota?
predictit · Democratic Party
South Dakota Senate winner?
Kalshi · Mike Rounds
South Dakota Senate winner?
Kalshi · vol $1 · Julian Beaudion
Sources & provenance
Biography
Public record
Wikipedia + state records
Money & donors
FEC filings
itemized + committee totals
Markets
Live venues
Polymarket · Kalshi
ALL FIGURES DRAWN FROM PUBLICLY AVAILABLE RECORDS · CANDIDATE PROFILES ARE NONPARTISAN AND CARRY NO ENDORSEMENT. · PHOTO: UNITED STATES CONGRESS · PUBLIC DOMAIN (WIKIMEDIA COMMONS)