Will the Republicans win the Idaho Senate race in 2026?

- [2026-05-19] Idaho held its primary; primary elections were held on May 19, and Risch won the Republican nomination with 67.3% of the vote, facing minimal opposition . https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Idaho - [2026-07-28/08-05] 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 , effectively making the race a two-way Risch vs. Achilles contest with only minor Libertarian/independent candidates remaining. https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Idaho - [2026-08-05] As of early August, the Achilles campaign has raised $692,245.06 in contributions and spent just over $500,000 of that , while Risch's campaign has garnered more than $4.4 million, FEC data as of Aug 4 showed — a roughly 6-to-1 cash advantage for Risch. https://idahocapitalsun.com/2026/08/05/risch-v-achilles-may-be-idahos-most-competitive-us-senate-race-in-years-heres-where-they-stand/ - [2026-08-05] Between Risch's first general election contest for U.S. Senate in 2008 and his last one in 2020, he has won with at least 58% of the vote each time , underscoring a long history of comfortable GOP wins. https://idahocapitalsun.com/2026/08/05/risch-v-achilles-may-be-idahos-most-competitive-us-senate-race-in-years-heres-where-they-stand/ - [2026-03-20] An early Public Policy Polling survey (639 likely voters, live interview/text) found Idaho Independent candidate Todd Achilles posting a three-point ballot test edge (41-38 percent) over three-term incumbent Sen. Risch , though analysts flagged it as possibly an Achilles-aligned poll. https://www.ellisinsight.com/senate/idaho-in-play/ - [2026-03-24] Despite that poll, analyst Jim Ellis concluded "Achilles still faces a difficult task of putting this race into play even though he is constructing a credible early effort," and that "Accounting for the most obvious positive and negative factors, Sen. Risch must s[till be regarded as the determinative favorite for re-election]." https://www.ellisinsight.com/senate/idaho-in-play/ - [2026-09-18] A more recent Advanced Targeting Research poll finds Todd Achilles (I) leading Jim Risch (R) in the U.S. Senate race, 50% to 39% , a wider gap than the March survey, though the pollster's independence/methodology was not detailed in available sources. https://politicalwire.com/2026/09/18/risch-trails-in-idaho-senate-race/ - [2026-09-22] Sabato's Crystal Ball's latest ratings update (moving Iowa, Kansas, Michigan) did not include a change for Idaho; notable independent candidates are running in Idaho, Montana, Nebraska, and South Dakota , but Idaho itself remains unlisted among races just moved. https://www.270towin.com/2026-senate-election/sabatos-crystal-ball-senate-2026 - [2026-09-23] The Cook Political Report's ratings update on this date changed Georgia, Kansas, and South Carolina but did not list any change for Idaho, implying no reclassification of the Idaho seat's competitiveness in Cook's latest release. https://www.270towin.com/2026-senate-election/cook-political-report-2026-senate - [2026-07-1x] Analysts have grouped Achilles with a wave of veteran independents challenging GOP incumbents in red states in 2026, alongside Dan Osborn (Nebraska), Brian Bengs (South Dakota) and Ty Pinkins (Mississippi)... Osborn... gained national attention after a surprisingly strong 2024 independent campaign (securing 47 percent of the vote) against Nebraska's incumbent GOP senator, a precedent frequently cited when assessing Achilles's chances. https://www.postregister.com/news/local/achilles-relishes-independent-senate-run-against-risch/article_fb92164e-ba27-44c0-a27b-3f58d33b0fc3.html - [historical] Republicans have not lost a Senate race in Idaho since 1974 , a 50+ year streak that remains the strongest structural fact favoring Risch. https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Idaho - [2026-09-26 (today)] No AP/Fox News/NBC race call has occurred; the election remains open with early voting/general election on November 3, 2026, still over five weeks away. BOTTOM LINE: As of late September 2026, Jim Risch remains the clear favorite based on Idaho's deep-red history (no Democratic/independent Senate win since 1974), a massive fundraising edge (~$4.4M vs ~$0.7M), and no major forecaster (Cook, Sabato) having moved Idaho off a safe/likely-R rating; however, a September 18 poll showing Achilles up 50-39 (following an earlier PPP poll showing a similar Achilles lead) and comparisons to Nebraska's 2024 near-upset indicate real, if unconfirmed, volatility worth monitoring before the November 3 election. NOT FOUND: An official, non-partisan/non-campaign-sponsored poll methodology or crosstabs for the September 2026 Advanced Targeting Research survey; any explicit Cook Political Report, Inside Elections, or Sabato's Crystal Ball rating label specifically for the Idaho Senate race as of September 2026 (only the ratings-change bulletins were available, which did not mention Idaho); any scheduled debates between Risch and Achilles and whether they have occurred.

- [2026-09-19] Republicans have not lost a Senate race in Idaho since 1974 , establishing a 50-year unbroken Republican winning streak in Idaho U.S. Senate contests (26 elections), the core reference class for this question. https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Idaho - [2020-11-03] In the most recent open-seat-adjacent cycle for this seat, Jim Risch defeated Paulette Jordan 62.62% to 33.25% , a ~29-point margin, illustrating the typical blowout scale of recent Idaho Senate results. https://en.wikipedia.org/wiki/2020_United_States_Senate_election_in_Idaho - [2022-11-08] Mike Crapo won Idaho's other Senate seat 60.68% to 28.74% over David Roth, with independent Scott Cleveland at 8.45% , confirming that even with third-party/independent entrants, Idaho Senate races have historically resolved decisively Republican. https://en.wikipedia.org/wiki/2022_United_States_Senate_election_in_Idaho - [2026-09-19] Aggregating multiple independent professional forecasters as of mid-September 2026, the race is rated "Solid R"/"Safe R" across the board: Cook Political Report (Solid R), Decision Desk HQ (Safe R), The Economist (Safe R), FiftyPlusOne (Safe R), Fox News (Solid R), Inside Elections (Solid R), Race to the WH (Safe R), RealClearPolitics (Solid R), Sabato's Crystal Ball (Safe R), Silver Bulletin (Solid R), and Split Ticket (Safe R) . https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Idaho - [2026-09-18] Wikipedia's polling averages show a mixed but Republican-leaning picture: Race to the WH's average through September 16 had Risch 40.3%, Achilles 38.9% (Risch +1.4%), while Silver Bulletin's average through August 13 had Risch 44.7%, Achilles 25.8% (Risch +18.9%) , with the combined average giving Risch roughly a 10-point edge. https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Idaho - [2026-09-18] One notably contrary data point: a partisan-leaning poll reported "Advanced Targeting Research poll in Idaho finds Todd Achilles (I) leading Jim Risch (R) in the U.S. Senate race, 50% to 39%" , showing significant polling divergence depending on pollster/sponsor. https://politicalwire.com/2026/09/18/risch-trails-in-idaho-senate-race/ - [2026-09-25] Real-money prediction markets (Kalshi) price the race far more comfortably Republican than the closest polls suggest: Kalshi prices Jim Risch at 92¢ — a 92% implied chance — to win the Idaho Senate race; Todd Achilles is at 8¢ . https://predictionmarketspicks.com/midterms-2026/idaho-senate - [2026-09-25] The same tracker notes forecaster consensus vs. market price alignment: "Forecasters rate the race Safe R; the gap between that rating and the price is what this page tracks." https://predictionmarketspicks.com/midterms-2026/idaho-senate - [2026-07-28] The generic-ballot/opposition dynamic shifted in September when the Democratic nominee exited: David Roth, who was the Democratic nominee, withdrew after Achilles entered the race with the support of Democratic leaders , consolidating the anti-Risch vote behind one independent candidate rather than splitting it — a structural change from the historical pattern (Dem+ind splitting the vote, as in 2022) that could modestly raise the challenger's ceiling versus past cycles. https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Idaho - [2026-04-01] Sen. Jim Risch, who will be 83 on Election Day, announced in April that he will seek reelection — and that he has the support of President Donald Trump for his bid , adding incumbency plus presidential endorsement to the base-rate advantage. https://www.cookpolitical.com/senate/race/488571 - [2026-05-19] Risch won the Republican nomination with 67.3% of the vote, facing minimal opposition , indicating no major primary weakness signal. NOT FOUND: A specific historical base rate figure (e.g., "% of Safe-R-rated Senate races that end up flipping") from a dedicated track-record study of Cook/Sabato ratings; no such aggregate statistic was located in the search results, only individual current ratings. BOTTOM LINE: Idaho's Senate seat sits in an extremely one-sided reference class — Republicans have won every Idaho U.S. Senate race since 1974 (26 consecutive contests), and virtually every current forecaster rates 2026 "Safe/Solid R" with prediction markets around 92% for Risch; while a few outlier polls and a consolidated independent challenger create some uncertainty, the overwhelming weight of historical precedent and current expert/market consensus point toward another Republican win.

**Strongest YES case (Republicans/Risch win): mechanism, evidence, prerequisites** The single most likely path to YES is simply "status quo holds": Risch's institutional, financial and structural advantages carry him to a mid-to-high single-digit or larger win, exactly as forecasters currently expect, with no debate exposure and no late-breaking Achilles surge materializing among actual voters (as opposed to online/partisan polling). - [2025-01/2025-03] In January, Risch received an endorsement from Trump, who called the Idaho politician one of his "strongest allies" in the Senate , an endorsement that predates the general election by nearly two years and was reaffirmed when Risch launched his campaign, with Senator Mike Crapo, Congressman Russ Fulcher, Governor Brad Little, Idaho Senate President Pro Tem Kelly Anthon, Idaho House Speaker Mike Moyle, and conservative leader Brent Regan among those joining Trump in endorsing Risch's re-election , showing a unified state and national GOP establishment behind him. - [2026-04/2026-05] Risch, 83, comfortably won Idaho's Republican primary shortly after polls closed, as chairman of the influential Senate Foreign Relations Committee , a leadership post that gives him outsized fundraising and earned-media capacity relative to a first-time independent challenger. - [2026-06-30] Per FEC-sourced figures on Wikipedia, as of June 30, 2026 Risch had raised $4,431,093 and spent $3,089,996, leaving $3,535,956 cash on hand, versus Achilles' $692,245 raised and only $194,227 cash on hand — a roughly 18-to-1 cash-on-hand advantage that lets Risch outspend Achilles on paid media through the final six weeks. (https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Idaho) - [2026-09-19] As tabulated on Wikipedia, eleven separate forecasters — Cook Political Report (Sept 15), Decision Desk HQ, The Economist, FiftyPlusOne, Fox News, Inside Elections, Race to the WH, RealClearPolitics, Sabato's Crystal Ball, Silver Bulletin, and Split Ticket — all rate the race Safe/Solid R as of mid-to-late September 2026, an unusual degree of unanimity across ideologically diverse outlets. (https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Idaho) - [2026-09-25] Real-money markets track this consensus almost exactly: Kalshi prices Jim Risch at 92¢ — a 92% implied chance — to win the Idaho Senate race; Todd Achilles is at 8¢ , on 161k contracts traded · 131k open interest, indicating meaningful liquidity behind the Republican-favored price rather than a thin/illiquid market. - [2026-09-18] Non-Achilles-aligned pollsters diverge sharply from the viral ATR/PPP surveys: Wikipedia's polling table shows Peak Insights (R), Aug 11–13, giving Risch a 52%-18% lead, and even the Democratic-leaning Change Research (D), July 28–30, still had Risch ahead 45%-21% in some crosstabs — suggesting the pro-Achilles 50-39 result is more likely an outlier tied to a specific (unlabeled) sponsor rather than a broad-based shift. (https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Idaho) - [2026-09-18] Wikipedia's own poll-average comparison shows the gap is aggregator-dependent: Race to the WH's rolling average had Risch +1.4% while Silver Bulletin's average (through mid-August) had Risch +18.9%, and the combined average still gives Risch a double-digit edge (Risch +10.1%), indicating that even blending in the Achilles-favorable series does not flip the net picture. (https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Idaho) - [2026-05-20 to present] Achilles has repeatedly proposed three statewide debates (August/September/October) and staged public confrontations (e.g., a September 12 airport encounter reported by Achilles as ending with Risch "calling security"), but Risch has consistently declined to debate at all through late September — a strategy that denies Achilles a shared stage and free media exposure, protecting the frontrunner's lead without requiring him to defend his record live. (https://idahocapitalsun.com/2026/05/21/independent-challenger-calls-on-risch-to-do-three-public-debates-ahead-of-idahos-general-election/; https://www.postregister.com/freeaccess/opinion-sen-risch-is-afraid-to-debate-his-opponent/article_6c0cc57e-bb24-4ed2-a6ad-7e0a4ebb6ad3.html) - [2026-04-30] Forecasters rate the race Safe R , and Risch has also picked up AIPAC's endorsement as a pro-Israel incumbent (per Wikipedia's sourcing, dated April 30, 2026), broadening his coalition beyond core Idaho GOP structures into national single-issue donor networks that can fund late ad buys if needed. - [historical mechanism] The core structural prerequisite for YES is simply that Idaho's 50-year unbroken pattern (no Democrat/independent Senate win since 1974) continues to hold in a state where He was endorsed by President Donald Trump, who has cruised to victory in the solidly Republican state every time he has appeared on the ballot since 2016 — meaning Achilles would need to build a genuinely novel, cross-partisan coalition exceeding anything Idaho general-election data has shown in the modern era, not just replicate Nebraska's 2024 near-miss (which itself still ended in a GOP win). BOTTOM LINE: The strongest YES path requires no new development at all — merely that Risch's overwhelming cash advantage, unanimous "Safe/Solid R" forecaster consensus, unbroken 50-year GOP streak, near-unanimous Idaho GOP/Trump establishment backing, and a 92%-priced, well-traded Kalshi market continue unperturbed through November 3, with Risch's no-debate strategy limiting Achilles' ability to convert isolated favorable polls into an actual multi-point polling and turnout trend. NOT FOUND: Any post-September-20 poll or forecaster update that further narrows or widens the Risch-Achilles gap; confirmation of whether any of the three proposed Risch-Achilles debates (August/September/October) ultimately occurred; a detailed methodology/crosstab disclosure for the Advanced Targeting Research poll that would clarify its partisan sponsorship.

- [2026-09-09] The Kalshi-based Idaho Senate market has consistently traded in a narrow band between 0.1% and 2.0%, reflecting the consensus view that the incumbent faces no serious electoral threat in the general election , with a contract snapshot showing Jim Risch is expected to win the Idaho Senate seat in 2026, an outcome the market prices at 96.0% . https://www.octagonai.co/markets/elections/senate/idaho-senate-winner - [2026-09-01] Decision Desk HQ's model independently corroborates the market: as reported, Decision Desk HQ, as of September 1, 2026, forecasts the race as "Safe Republican" with a 99% win probability for Senator Risch , a source separate from Kalshi/Polymarket pricing. https://www.octagonai.co/markets/elections/senate/idaho-senate-winner - [2026-09-09] Neither of the two biggest "shock" events so far has dented Risch's pricing: the most significant development, incumbent Senator Jim Risch securing the Republican primary on May 19, 2026, with 67.26% of the vote, produced no material change in pricing, and the subsequent withdrawal of the Democratic candidate also failed to move the market, suggesting traders had fully discounted the primary's outcome . https://www.octagonai.co/markets/elections/senate/idaho-senate-winner - [2026-06-06/07] Risch's own campaign-commissioned poll (Peak Insights, N=500 LV, MoE ±4%) found him leading Roth by 40 points and, critically, that on a full-field ballot he also holds double-digit leads against the independents: "Senator Risch also leads by wide margins over both Independent candidates (+48 Risch over Todd Achilles and +50% Risch over Natalie Fleming) and the Libertarian candidate (+53 Risch over Matt Loesby)" — a data point predating and far more favorable to Risch than the later Achilles-aligned polls. https://senatorrisch.com/wp-content/uploads/2026/06/Polling-June-2026-Memo.pdf (via https://www.octagonai.co/markets/elections/senate/idaho-senate-winner) - [2026-08-11/13] A later Peak Insights survey (500 LV, ±4.0% MoE) in the Wikipedia polling table still shows Risch far ahead, 52% to 18% for Achilles with 12% other/11% undecided rounding, indicating the incumbent's internal-poll advantage persisted even after Roth's withdrawal cleared the field. https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Idaho - [2026-08-04/07] Not all August data agrees, however — even the ostensibly favorable Bullfinch Group poll (608 LV, ±3.9%) shows a much tighter head-to-head, 33% Risch to 38% Achilles, underscoring genuine pollster-to-pollster variance rather than uniform Risch strength; this and the September 18 Advanced Targeting Research 39-50 result together suggest the "safe" ratings may be lagging real movement, a point the NO case should not over-dismiss. https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_Idaho - [2026-02-02] Structurally, Idaho's registered-voter rolls remain heavily Republican: as of the Secretary of State's February 2026 report, Total Idaho Registered Voters: 1,021,711, last updated February 2, 2026 , and per the May 2026 breakdown Republicans make up 62% of Idaho registered voters, or more than 631,000 people, unaffiliated voters make up 25% or more than 257,000, and over 120,000 Democrats comprise 12% of Idaho registered voters — meaning even total consolidation of Democratic and unaffiliated voters behind Achilles would still leave Republicans as a governing plurality/majority bloc. - [2026-08-05] Fundraising gap has held steady into the general: Achilles has raised more than $692,000, while Risch's war chest sits above $3.3 million , keeping a roughly 5-to-1 cash advantage that lets the incumbent dominate paid media in the campaign's closing weeks. https://thefulcrum.us/elections/idaho-senate-race-independent-todd-achilles-vs-jim-risch - [2026-09-09] Aggregating cross-source consensus, Octagon's report notes "Prediction markets and political forecasters heavily favor Senator Risch, with win probabilities for a Republican victory generally assigned between 93-96%" , meaning the "safe Republican" call is not a single outlet's view but a convergent read across Polymarket, Kalshi, Manifold, DDHQ and Akashic. https://www.octagonai.co/markets/elections/senate/idaho-senate-winner - [2026-09-18] Even the single most Achilles-favorable public poll circulating — 50-39 from Advanced Targeting Research — has not been picked up or echoed by any of the major forecaster rating changes tracked through late September, and no mainstream pollster (Race to the WH average, Silver Bulletin, RCP) has replicated a double-digit Achilles lead, suggesting it may be an outlier or campaign-aligned poll rather than a trend confirmed by neutral trackers. https://politicalwire.com/2026/09/18/risch-trails-in-idaho-senate-race/ - [2024-11-05] The Nebraska precedent frequently cited to justify Achilles optimism actually cuts toward the NO case on close inspection: in that most-analogous race, Independent Dan Osborn was able to garner the Nebraska Democratic Party's support, and with strong fundraising catapulted himself into a competitive battle with Sen. Deb Fischer (R); in the end, Sen. Fischer prevailed with a six-point victory margin — i.e., the closest recent red-state "strong independent" campaign still ended in a clear GOP win despite a lead in polling averages during the race. https://www.ellisinsight.com/senate/idaho-in-play/ - [2026-09-26] No AP/Fox News/NBC call exists yet and none is expected until after November 3 ballots are counted; given Idaho's history of non-competitive, quickly-called Senate results (e.g., 2020's 62.6%-33.3% and 2014's 65.3%-34.7% Risch victories), there is no mechanism visible (litigation, recount trigger, or certification delay) that would prevent a same-night or next-day call for Risch if polling and fundamentals hold. https://en.wikipedia.org/wiki/2020_United_States_Senate_election_in_Idaho, https://en.wikipedia.org/wiki/2014_United_States_Senate_election_in_Idaho BOTTOM LINE: The strongest NO-resolution (i.e., Republican-win) case rests on converging, independent lines of evidence — a 96%/99% market-and-model consensus that has not moved even after the primary or Roth's withdrawal, an internal Risch poll showing 48-52 point leads over Achilles in a full field, a 5-to-1+ fundraising edge, and Idaho's 62%-Republican voter registration — all reinforcing 50+ years of unbroken GOP wins; the main counter-evidence (the Sept. 18 Achilles +11 poll and one August Bullfinch survey showing a tie/Achilles edge) remains unreplicated by neutral trackers and is directly comparable to Nebraska 2024, where a similarly polling-competitive independent still lost by six points. NOT FOUND: Full methodology/crosstabs for the Advanced Targeting Research and Bullfinch Group polls (to assess partisan sponsorship or likely-voter screening); any indication that AP, Fox News, or NBC have flagged Idaho as a race requiring extended tabulation or recount procedures; a post-September 18 poll from a nonpartisan/media pollster confirming or refuting the Achilles 50-39 result.