2026 United States Senate election in Idaho

The 2026 United States Senate election in Idaho will be held on November 3, 2026, to elect a member of the United States Senate to represent the state of Idaho. Republican incumbent Jim Risch is seeking a fourth term. He is being challenged by independent former state representative Todd Achilles.

Primary elections were held on May 19. Risch won the Republican nomination with 67.3% of the vote, facing minimal opposition. The Democratic nomination was won by realtor David Roth, who was the nominee in 2022, but after Achilles entered the race in July with the support of Democratic leaders, Roth withdrew near the end of the month.

Republicans have not lost a Senate race in Idaho since 1974.

Republican primary Candidates Nominee Jim Risch, incumbent U.S. senator Eliminated in primary Joe Evans, data engineer and Libertarian nominee for ID-1 in 2020 Denny LaVe, entrepreneur Josh Roy, engineer

Endorsements

Fundraising Campaign finance reports as of April 29, 2026CandidateRaisedSpentCash on handJim Risch (R)$3,937,857$2,402,936$3,729,780Denny Lave (R)$164,600$109,923$54,677Josh Roy (R)$27,384$14,495$12,889Joe Evans (R)$7,741$7,650$91Source: Federal Election Commission

Results

Democratic primary Candidates Withdrew after nomination David Roth, realtor, nominee for U.S. Senate in 2022, and nominee for ID-2 in 2024

Eliminated in primary Nickolas Bonds, estate executive Brad Moore

Endorsements

Fundraising Campaign finance reports as of April 29, 2026CandidateRaisedSpentCash on hand David Roth (D)$8,642$8,186$1,051Source: Federal Election Commission

Results

Libertarian primary Candidates Nominee Matt Loesby, nominee for in 2024

Results

Independents Candidates Declared Todd Achilles, former Democratic state representative from the 16th district (2024–2025) Natalie Fleming, software developer

Fundraising Campaign finance reports as of June 30, 2026CandidateRaisedSpentCash on hand Todd Achilles (I)$692,245$506,311$194,226Source: Federal Election Commission

General election Campaign On July 8, 2026, the Ada County Democratic Central Committee sent Roth a letter giving him until August 12 to prove that his campaign "has turned a corner" by raising $50,000 and producing a campaign plan, or the committee would consider endorsing independent candidate Todd Achilles instead. The committee said it was concerned that Roth's campaign was "not positioned to meet the moment” and argued that "we can't afford to let this moment slip away in the best political environment Idaho has seen in decades." Roth called the demands "completely ridiculous" and said he had no intention of complying, while accusing local Democratic leaders of trying to force him out of the race in favor of Achilles. On July 28, Roth announced he would drop out of the race.

Predictions SourceRankingAs ofThe Cook Political ReportSeptember 23, 2026Decision Desk HQOctober 2, 2026The EconomistOctober 3, 2026FiftyPlusOneOctober 3, 2026Fox NewsSeptember 22, 2026Inside ElectionsOctober 1, 2026RealClearPoliticsSeptember 24, 2026Sabato's Crystal BallSeptember 22, 2026Silver BulletinOctober 3, 2026Split TicketOctober 2, 2026

Endorsements

Fundraising Campaign finance reports as of June 30, 2026CandidateRaisedSpentCash on hand Jim Risch (R)$4,431,093$3,089,996$3,535,956 Todd Achilles (I)$692,245$506,311$194,227Source: Federal Election Commission

Polling Aggregate polls Source of pollaggregation Datesadministered Datesupdated JimRisch (R) ToddAchilles (I)Other/Undecided MarginRace to the WHthrough September 30, 2026October 2, 202644.6%31.8%23.6%Risch +12.8%Silver Bulletinthrough August 13, 2026September 18, 202645.7%26.3%28.0%Risch +19.4%Average45.2%29.1%25.7%Risch +16.1%

Poll source Date(s)administered Samplesize Marginof error JimRisch (R) ToddAchilles (I) Other Undecided Peak Insights (R)September 28–30, 2026500 (LV)±4%49%24%11%15%Advanced Targeting ResearchSeptember 13–16, 2026700 (RV)±3.7%39%50%11%39%46%5%11%Peak Insights (R)August 11–13, 2026500 (LV)±4.0%52%18%12%17%The Bullfinch GroupAugust 4–7, 2026608 (LV)±3.9%33%38%29%34%30%4%32%Change Research (D)July 28–30, 20261,213 (LV)±3.0%45%21%11%22%The Bullfinch GroupMay 29 – June 1, 2026774 (RV)±3.5%40%36%24% May 19, 2026 Primary electionsPublic Policy Polling (I)March 16–17, 2026639 (RV)±3.9%48%34%18%

Jim Risch vs. David Roth vs. Todd Achilles Poll source Date(s)administered Samplesize Margin JimRisch (R) DavidRoth (D) ToddAchilles (I) Other UndecidedChange Research (I)July 28–30, 20261,213 (LV)±3.0%43%13%19%6%18%Peak Insights (R)June 6–7, 2026500 (LV)±4.0%55%15%7%7%14%

Jim Risch vs. David Roth Poll source Date(s)administered Samplesize Marginof error JimRisch (R) DavidRoth (D) UndecidedThe Bullfinch GroupMay 29 – June 1, 2026774 (RV)±3.5%50%33%17%

2026 United States Senate election in Idaho

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