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2026 United States Senate election in Oklahoma

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2026 United States Senate election in Oklahoma
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November 3, 2026 (2026-11-03)
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Party Republican Democratic
Incumbent U.S. senator

Alan Armstrong [a]
Republican



The 2026 United States Senate election in Oklahoma will be held on November 3, 2026, to elect a member of the U.S. Senate to represent the state of Oklahoma. Incumbent Senator Alan Armstrong, who was appointed after the resignation of former Senator Markwayne Mullin, cannot seek a full term due to his agreement when taking the seat. [1] Mullin was first elected in a 2022 special election triggered by the impending resignation of Jim Inhofe. Mullin initially announced that he was planning to seek his first full term in office, but in March 2026, President Donald Trump announced that Mullin would be his next nominee for secretary of homeland security; Mullin subsequently resigned the seat to take that position. Primary elections will be held on June 16, 2026. Democrats have not won a U.S. Senate race in Oklahoma since 1990.

Contents

Background

United States Senate elections in Oklahoma are scheduled to be held on November 3, 2026, to elect a member of the U.S. Senate to represent the state of Oklahoma. Primary elections are scheduled for June 16 with a potential runoff election set for August 25 if no candidate receives over 50 percent of the vote in June. The candidate filing deadline is April 3. [2]

The seat was originally held by Jim Inhofe, who was last elected in 2020. Two years later, in 2022, then-Congressman Markwayne Mullin won a special election to finish Inhofe's term after Inhofe had announced his resignation at the end of the 117th Congress. [3] After Donald Trump won the 2024 United States presidential election, Mullin was rumored as a contender for secretary of the interior. [4] Mullin's resignation would have affected the gubernatorial election, as governor Kevin Stitt would have appointed a replacement who must sign a potentially unenforceable [b] oath promising not to run for reelection in 2026. [5] Mullin was ultimately not nominated as the secretary of interior. [6] However, in March 2026, Mullin was named as Trump's pick to replace secretary of homeland security Kristi Noem [7] and was confirmed on March 23, 2026. [8]

Interim appointment

Mullin was confirmed as the secretary of homeland security [8] and resigned as senator on March 23, 2026. Governor Kevin Stitt was required to appoint a replacement within 30 days. He stated the appointee would serve the remainder of the current term until January 3, 2027, though state law provides that the appointment lasts only until the November election is certified by the Oklahoma State Election Board. [9] The interim appointee must have been a registered Republican for the past five years, [10] and they would have to sign an oath stating they will not run in the 2026 election. [11] On March 24, 2026, Governor Stitt announced that oil and gas executive Alan Armstrong would replace Mullin, he was sworn in by Chuck Grassley later that day. [12] [13]

Republican primary

Candidates

On March 5, 2026, Trump announced that Mullin would replace Homeland Security secretary Kristi Noem at the end of the month. Mullin was confirmed by the Senate on March 23, 2026. [8]

Declared

Withdrawn

Declined

Ineligible

Endorsements

Kevin Hern
Executive branch officials
U.S. senators
U.S. representatives
Organizations
Markwayne Mullin (withdrawn)
Executive branch officials
Organizations
Declined to endorse
U.S. senators

Fundraising

Campaign finance reports as of December 31, 2025
CandidateRaisedSpentCash on hand
Kevin Hern (R)$1,895,468$820,291$2,223,843
Source: Federal Election Commission [40]

Polling

Hypothetical polling
Poll sourceDate(s)
administered		Sample
size [d] 		Margin
of error		Stephanie
Bice		Kevin
Hern		Kevin
Stitt		Undecided
Pulse Decision Science (R) [41] [A] March 7–9, 2026510 (LV)± 4.4%–52%40%8%
37%49%–14%

Democratic primary

Candidates

Declared

Fundraising

Campaign finance reports as of December 31, 2025
CandidateRaisedSpentCash on hand
Troy Green (D)$10,727$3,211$7,516
N'Kiyla "Jasmine" Thomas (D)$19,427$17,729$2,634
Source: Federal Election Commission [40]

General election

Candidates

Predictions

SourceRankingAs of
Inside Elections [45] Solid RAugust 12, 2025
The Cook Political Report [46] Solid ROctober 14, 2025
Sabato's Crystal Ball [47] Safe RAugust 12, 2025
Race To The WH [48] Safe RSeptember 4, 2025

Notes

  1. ↑ Incumbent Markwayne Mullin was nominated by President Donald Trump as the nominee of United States Secretary of Homeland Security. He vacated his Senate seat and governor Kevin Stitt appointed Armstrong as interim successor.
  2. ↑ While state law requires the appointee to sign an oath promising not to run for the following term, federal law may prevent its enforcement. The oath could lead to litigation if an appointee challenges the law. [5]
  3. ↑ Armstrong is prohibited from running for a full term by state law.
  4. ↑ Key:
    A – all adults
    RV – registered voters
    LV – likely voters
    V – unclear

Partisan clients

  1. ↑ Poll sponsored by Club for Growth

References

  1. ↑ "Who is Alan Armstrong? Meet the man appointed to Oklahoma's open U.S. Senate seat". KOCO 5 . Hearst Television. March 6, 2026. Retrieved March 24, 2026.
  2. ↑ "United States Senate election in Oklahoma, 2026". ballotpedia.org. Ballotpedia . Retrieved November 12, 2024.
  3. ↑ Casteel, Chris (November 8, 2022). "Markwayne Mullin defeats Kendra Horn in Oklahoma US Senate race". The Oklahoman . Retrieved March 8, 2026.
  4. ↑ Liese, Sarah; Hallum, Katie (November 12, 2024). "Oklahoma Sen. Markwayne Mullin reportedly in running for Trump cabinet post". KGOU . Retrieved November 12, 2024.
  5. 1 2 Savage, Tres; Brinkman, Bennett (November 12, 2024). "Domino scenarios: Sen. Markwayne Mullin Cabinet rumor spurs speculation". NonDoc. Retrieved November 12, 2024.
  6. ↑ Wahpekeche, Dacoda (November 15, 2024). "Sen. Markwayne Mullin talks possibly being in Donald Trump's Cabinet". KOCO . Retrieved November 16, 2024.
  7. ↑ "Noem out, Trump picks Mullin as DHS secretary". POLITICO. March 5, 2026. Retrieved March 7, 2026.
  8. 1 2 3 4 Bustillo, Ximena (March 23, 2026). "Markwayne Mullin confirmed as the next secretary of Homeland Security". NPR. Retrieved March 24, 2026.
  9. 1 2 3 4 5 Aston, Alexia; Guinnip, Maria (March 7, 2026). "These names are floating around as Markwayne Mullin's Senate replacement". The Oklahoman . Retrieved March 7, 2026.
  10. ↑ "Appointment of Mullin shakes up 2026 Oklahoma elections". KGOU NPR. Retrieved March 8, 2026.
  11. ↑ Ramos, Lionel (March 5, 2026). "Markwayne Mullin tapped to lead Homeland Security. Here's what happens to his Senate seat". KOSU. Retrieved March 8, 2026.
  12. ↑ Svirnovskiy, Gregory (March 24, 2026). "Stitt picks energy executive Alan Armstrong as next Oklahoma senator". Politico . Retrieved March 24, 2026.
  13. ↑ Carney, Jordan (March 24, 2026). "Introducing Sen. Alan Armstrong". Politico . Retrieved March 24, 2026.
  14. 1 2 "Candidate filing". filings.okelections.gov. Oklahoma State Election Board . Retrieved April 1, 2026.
  15. 1 2 3 4 5 6 7 8 9 10 Crumbacher, Katrina (March 31, 2026). "Who's running as Oklahoma candidate filing opens?". The Journal Record. Archived from the original on April 1, 2026. Retrieved April 2, 2026.
  16. 1 2 3 4 5 "OK Candidate Filing". Oklahoma Elections. Retrieved April 3, 2026.
  17. ↑ Fortinsky, Sarah (March 11, 2026). "Hern launches Senate bid for Mullin's Oklahoma seat". The Hill. Retrieved March 11, 2026.
  18. 1 2 "OK Candidate Filing". Oklahoma Elections. Retrieved April 3, 2026.
  19. ↑ "Races for the U.S. Senate and House". Oklahoma Constitution. Fall 2025. Retrieved November 29, 2025.
  20. ↑ Mueller, Julia (March 13, 2026). "Bice declines to run for Oklahoma Senate seat". The Hill . Retrieved March 13, 2026.
  21. 1 2 Gorman, Reese; Luetkemeyer, Em; Huiskes, Helen (March 5, 2026). "Oklahoma Republicans Are Already Eyeing Markwayne Mullin's Senate Seat". NOTUS. Retrieved March 5, 2026.
  22. 1 2 Hans, Christian (March 12, 2026). "U.S. Rep. Kevin Hern speaks after launching bid for Oklahoma's vacant Senate seat". News9.com. Retrieved March 12, 2026.
  23. ↑ Razor, Calen; Mccarthy, Mia (March 6, 2026). "Mullin's sudden exit shakes up the Hill agenda". POLITICO. Retrieved March 8, 2026.
  24. ↑ Metzer, Steve (March 9, 2026). "Several identified as potential temporary successors to Mullin". Tulsa World . Retrieved March 10, 2026. Former Tulsa Mayor G.T. Bynum and current Lt. Gov. Matt Pinnell may have been considered among early contenders, but both said on social media Monday that they would not be running for the seat.
  25. 1 2 3 Dennison, Anna (March 13, 2026). "Gov. Kevin Stitt says he will not run for U.S. Senate, plans to finish Governor's term". Tulsa World . Retrieved March 13, 2026.
  26. ↑ Guinnip, Maria. "OKC election results: David Holt reelected mayor after quiet campaign". The Oklahoman. Retrieved March 25, 2026.
  27. ↑ Faught, Jamison (March 7, 2026). "Mullin to DHS: who might replace him in the Senate, plus other repercussions". Muskogee Politico. Retrieved March 7, 2026.
  28. 1 2 Schilke, Rachel (March 5, 2026). "Stephanie Bice and Kevin Hern eye Oklahoma Senate if Mullin heads to DHS". Washington Examiner. Retrieved March 5, 2026.
  29. ↑ Dowers, Graham (March 9, 2026). "Lt. Gov. Matt Pinnell announces he will not run for governor". KOTV-DT . Retrieved March 9, 2026.
  30. ↑ Kliewer, Addison (March 25, 2026). "President Donald Trump endorses T.W. Shannon for Oklahoma lieutenant governor". KOCO. Retrieved March 25, 2026.
  31. ↑ Svirnovskiy, Gregory (March 24, 2026). "Stitt picks energy executive Alan Armstrong as next Oklahoma senator". Politico. Retrieved March 24, 2026.{{cite web}}: CS1 maint: url-status (link)
  32. 1 2 Onstot, Evan (March 14, 2026). "Trump endorses Kevin Hern for Oklahoma Senate seat". KOCO. Retrieved March 14, 2026.
  33. 1 2 Krehbiel, Randy (May 18, 2025). "Political notebook: Strong income tax receipts keep state revenue on track". Tulsa World. Retrieved May 20, 2025.
  34. 1 2 3 Krehbiel, Randy (March 11, 2026). "Oklahoma Congressman Kevin Hern formally announces Senate bid". Tulsa World . Retrieved March 11, 2026.
  35. 1 2 Talbot, Patrick (March 14, 2026). "Oklahoma Rep. Kevin Hern endorsed by Trump, lawmakers for Sen. Mullin's seat". KOCO. Retrieved March 15, 2026.
  36. 1 2 "Lankford on the talking filibuster – and more". Punchbowl News. Retrieved March 15, 2026. Lankford said that he is not going to endorse in the primary. Rep. Kevin Hern (R-Okla.) is the only declared candidate, but candidates have until early April to jump in.
  37. 1 2 Swai, Finya (March 19, 2026). "Thune, Tim Scott endorse Hern for open Oklahoma Senate seat". Politico . Retrieved March 19, 2026.
  38. ↑ "Club for Growth PAC Endorses Rep. Kevin Hern in OK-SEN Race". Club for Growth. Retrieved March 14, 2026.
  39. ↑ "- AIPAC Political Portal". candidates.aipacpac.org. Retrieved April 28, 2025.
  40. 1 2 "2026 Election United States Senate - Oklahoma". fec.gov. Federal Election Commission . Retrieved April 23, 2025.
  41. ↑ Allen, Bryon (March 10, 2026). "Recent Pulse Poll Kevin Hern would lead either Kevin Stitt or Stephanie Bice in a Republican Primary for U.S. Senate" (PDF). Pulse Decision Science. Retrieved March 11, 2026.
  42. ↑ Dowers, Graham (January 17, 2026). "Democrat Jim Priest enters U.S. Senate race against Mullin". News 9 . Retrieved January 17, 2026.
  43. ↑ Fields, Lace (July 25, 2025). "Democratic U.S. Senate candidate makes stop in McAlester". McAlester News-Capital . Retrieved October 30, 2025.
  44. ↑ Brumbelow, Cole (April 1, 2026). "Candidates file for local, county and statewide races in Oklahoma". KSWO. Retrieved April 3, 2026.
  45. ↑ "Senate Ratings". Inside Elections. Retrieved January 14, 2025.
  46. ↑ "2026 CPR Senate Race Ratings". Cook Political Report. Retrieved February 11, 2025.
  47. ↑ "2026 Senate ratings". Sabato's Crystal Ball. Retrieved February 13, 2025.
  48. ↑ "2026 Senate Forecast". Race to the WH. Retrieved March 19, 2025.

Official campaign websites

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