Will the Republicans win the New Hampshire Senate race in 2026?

- [2026-09-08] Primary elections were held: Pappas won the Democratic nomination with 65% of the vote against medical scientist Karishma Manzur, and Sununu won the Republican nomination with 68.5% of the vote against former Massachusetts senator Scott Brown , confirmed by official NBC primary results showing John Sununu wins the New Hampshire primary and Chris Pappas wins the New Hampshire primary . (https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_New_Hampshire) - [2026-09-08] This is the first open Senate election in New Hampshire since 2010, and Republicans have not won a Senate election in New Hampshire since that race , giving historical context for GOP's uphill climb. (https://en.wikipedia.org/wiki/2026_United_States_Senate_election_in_New_Hampshire) - [2026-10-05] Latest Rasmussen Reports poll (Oct 2-4, n=979 LV) shows Democrat Rep. Chris Pappas leading by five points over former Republican Sen. John Sununu, with 49% of likely voters for Pappas vs. 44% for Sununu ; 3% for Constitution Party candidate Edmond Laplante, 4% undecided, and Sununu has gained ground since early September when Pappas led by 11 points, 45% to 34% . (https://www.rasmussenreports.com/public_content/politics/elections/election_2026/election_2026_new_hampshire_senate2) - [2026-10-06] RealClearPolling aggregate (polls 9/9–10/4) puts the race at RCP Average Pappas 48.7, Sununu 43.1, a Pappas+5.6 spread, consistent across seven recent polls (Rasmussen, St. Anselm, Trafalgar, UNH, NYT/Siena, InsiderAdvantage, co/efficient) all showing Pappas ahead or tied. (https://www.realclearpolling.com/elections/senate/2026/new-hampshire) - [2026-09-28/29] St. Anselm College poll shows Pappas 51, Sununu 44 (Pappas+7). (https://www.realclearpolling.com/elections/senate/2026/new-hampshire) - [2026-09-26/27] Trafalgar Group poll shows Pappas 47, Sununu 41 (Pappas+6). (https://www.realclearpolling.com/elections/senate/2026/new-hampshire) - [2026-09-15/22] NYT/Siena poll shows Pappas 50, Sununu 45 (Pappas+5). (https://www.realclearpolling.com/elections/senate/2026/new-hampshire) - [2026-09-17/21] University of New Hampshire poll shows Pappas 50, Sununu 42 (Pappas+8). (https://www.realclearpolling.com/elections/senate/2026/new-hampshire) - [2026-09-15] Cook Political Report's race rating remains "Lean D" (last updated Sep 15, 2026), with a Cook PVI of D+2 for the state. Cook's analysis notes: "Republicans are bullish on New Hampshire after a recent Emerson College survey showed the race in a statistical tie between Democratic Rep. Chris Pappas and former Sen. John E. Sununu," but concludes "If this is shaping up to be a difficult midterm cycle and a favorable Democratic environment, we have a hard time seeing Republicans pulling off the upset in the Granite State." (https://www.cookpolitical.com/senate/race/488636) - [2026-10-05] Ballotpedia's general-election page lists the three-candidate field for Nov 3: Pappas (D), Sununu (R), and Matt Giovonizzi (Independent), confirming no new nominee substitutions since the primary. (https://ballotpedia.org/United_States_Senate_election_in_New_Hampshire,_2026) - [2026-11-03] Election day itself (within the market's window, before the Nov 4 trading close) is the next scheduled event that will determine the outcome; no debates or additional events were found scheduled in the final weeks beyond standard general-election campaigning. BOTTOM LINE: As of early October 2026, Chris Pappas (D) leads John Sununu (R) by roughly 5-8 points across nearly every public poll since mid-September, and the race is rated "Lean Democrat" by Cook Political Report; Sununu has narrowed the gap somewhat from an 11-point Pappas lead in early September but remains the clear underdog heading into the Nov. 3 general election. NOT FOUND: No AP/Fox News/NBC race call exists yet (election is Nov 3, after today's date); no post-primary debate schedule or additional head-to-head polling after Oct 4, 2026 was located; no reports of a nominee substitution or major scandal in the final stretch.

- [2026-09-15] Cook Political Report moved the New Hampshire Senate race from "Lean Democratic" to "Toss Up," a rating highlighted as a rare bright spot for the GOP even as Democrats were otherwise polling well nationally. The nonpartisan Cook Political Report changed its rating of New Hampshire's Senate race from "Lean Democratic" to "Toss Up," a shift described as "a rare positive development for Republicans as evidence mounts that Democrats are positioned for major victories in the midterms." (washingtonpost.com) - [2026-09-22] Sabato's Crystal Ball still rated the seat "Lean Democratic" as of its most recent (September 22) update, a notch more favorable to Democrats than Cook's Toss Up call. (270towin.com) - [2026-03-17] Earlier in the cycle, Cook, Sabato's Crystal Ball and Inside Elections had all rated the race Lean/Tilt Democratic, reflecting the state's recent partisan lean before the race tightened over the summer/fall. As of March 17, 2026, The Cook Political Report and Larry Sabato's Crystal Ball each rated the general election Lean Democratic, while Inside Elections rated it Tilt Democratic. (ballotpedia.org) - [2026-10-05] Decision Desk HQ's quantitative forecast (blending fundamentals, polls, and markets) puts Democrats as "likely to win" at 78% vs. 22% for Republicans. Decision Desk HQ's forecast blends 37% fundamentals, 38% polls, and 25% markets, and currently rates Democrats as likely to win New Hampshire at 78%. (decisiondeskhq.com) - [2026-10-01] A separate model (FiftyPlusOne) shows a smaller Democratic edge, with Pappas leading Sununu by about 5 points. Oct 1, 2026 Pappas +5, Pappas 48.4%, Sununu 43.1% . (fiftyplusone.news) - [2026-09-27] The polling average across five recent polls (late Sept.) shows Pappas leading Sununu roughly 48% to 43%, with individual polls ranging from a tie (co/efficient) to Pappas +8 (UNH, InsiderAdvantage). (270towin.com) - Historical base rate: this is the first open-seat contest for this specific Senate seat since 2010, and the first for this particular Class 2 seat since 1990; this will be the first open Senate election in New Hampshire since 2010, and Republicans have not won a Senate election in New Hampshire since that race. (en.wikipedia.org) - The last time Republicans won this specific NH Senate seat was 2002, when John Sununu (the current GOP nominee) won it as an open seat before losing it to Shaheen in 2008; as of 2025, this was the last time Republicans won the Class 2 Senate seat in New Hampshire; Shaheen defeated Sununu in their 2008 rematch and has held it since 2009. (en.wikipedia.org) - Despite the federal Democratic lean, New Hampshire currently has unified Republican state government, suggesting the state is more competitive down-ballot than its presidential vote implies. New Hampshire has a Republican trifecta and a Republican triplex; the Republican Party controls the offices of governor, secretary of state, attorney general, and both chambers of the state legislature. (ballotpedia.org) - Open-seat context: Shaheen's retirement was widely viewed by analysts as removing the Democrats' strongest structural advantage (incumbency) in a state that had been trending slightly more Republican; the move "robs Democrats of the incumbency advantage in a state that has moved slightly toward Republicans in recent years." (yahoo.com) - Track record caveat: Cook, Sabato, and Inside Elections ratings are qualitative expert judgments, not point probabilities, and have shifted materially within this single cycle (Lean D → Toss Up on Cook), indicating real uncertainty rather than a settled outside-view consensus. - Outside-view synthesis: combining the "open seat, no incumbent" reference class (more volatile than incumbent races) with NH's 21st-century Senate history (narrowly decided races, frequent flips: 2002 R, 2008 D, 2014 D, 2020 D) suggests this is a genuine toss-up-leaning-Democratic race rather than a lopsided one. BOTTOM LINE: The base-rate/outside-view picture is mixed-to-slightly-Democratic-favored: quantitative models (DDHQ 78% D, poll averages ~5 pt D lead) point toward a Democratic win, but qualitative experts have moved toward "Toss Up" (Cook) given the open-seat dynamic and a competitive, historically swingy NH Senate seat, with the GOP's John Sununu running to reclaim a seat he once held. NOT FOUND: A specific numeric win-probability track record for Cook/Sabato/Inside Elections "Toss Up" vs "Lean" categories' historical hit rates; comprehensive full list of all historical NH Senate races since statehood for a longer-run base rate beyond the 1990–2024 period covered above.

YES means: John E. Sununu (R) is declared winner of the 2026 New Hampshire U.S. Senate election, called by AP, Fox News, and NBC for the same candidate (or certified as winner), resolving the market "Republicans win" to Yes. - [2026-08-20/24] The University of New Hampshire Survey Center poll (n=1,878 LV, ±2.3%) actually had Sununu *ahead* of Pappas, 45%-43%, the Republican's only outright lead of the cycle in a large, reputable tracking poll, showing the race was genuinely fluid as recently as late August. (https://www.newsweek.com/sununu-pappas-new-hampshire-senate-race-polls-12419856) - [2026-10-05] TIME reports New Hampshire may be Republicans' best chance for an upset over a Democratic contender, with the GOP "throwing more money into the Live Free or Die state in hopes of making it happen." - [2026-10-05] Outside spending has already topped $50 million in a state with under 1 million registered voters, including $17 million from the Senate Leadership Fund, $10 million from the Trump-aligned No Going Back PAC, and over $2 million from Americans for Prosperity Action — a financial commitment on the GOP side that dwarfs Senate Majority PAC's $10 million for Pappas. (https://time.com/article/2026/10/05/new-hampshire-blue-wave-republicans-sununu-pappas/) - [2026-10-05] Despite trailing by five points in the NYT poll, 42% of NH voters say Sununu "has good character," and among independents — who typically decide NH elections — he holds a 10-point advantage over Pappas on that character question, a crossover-appeal signal distinct from the horse-race number. (https://time.com/article/2026/10/05/new-hampshire-blue-wave-republicans-sununu-pappas/) - [2026-10-05] TIME notes a "shy Sununu voter" dynamic: Democrats hold a 9-point edge on generic preference for a Democratic Senate, yet Pappas' actual polling lead is only five points, and roughly 8% of voters who prefer a Democratic Senate nonetheless say they plan to vote for Sununu — suggesting the topline polling may understate his ceiling. (https://time.com/article/2026/10/05/new-hampshire-blue-wave-republicans-sununu-pappas/) - [2026-10-06] Newsweek quotes a political professor's assessment that "Republicans have an avenue in NH, but it is a narrow one," while noting Sununu "cutting a double digit Rasmussen lead down to 5 points fits a race Cook already calls a toss up" — framing the trend as momentum toward Sununu, not away. - [2026-10-06] RealClearPolitics' own race analysis explicitly concedes "Sununu is probably the best candidate Republicans could have gotten, and the name still means something here," and separately judges "Sununu is exactly the sort of candidate who can outrun a Democratic wave." - [2026-10-05] The Sununu family brand is a structural asset distinct from generic-R support: both his father and brother were NH governors, and his brother Chris Sununu remains highly popular in the state, giving the nominee name-recognition and crossover credibility that other 2026 GOP Senate recruits (e.g., in Michigan, Georgia) lack. (https://time.com/article/2026/10/05/new-hampshire-blue-wave-republicans-sununu-pappas/) - [2026-10-06] Sununu's position as a non-MAGA, Bush-wing Republican (he once called Trump a "loser" before accepting Trump's endorsement) insulates him somewhat from the president's unpopularity that is dragging down other 2026 GOP Senate candidates nationally, even as 60% of NH voters disapprove of Trump. (https://time.com/article/2026/10/05/new-hampshire-blue-wave-republicans-sununu-pappas/) - [2026-10-06] NH's recent history of ticket-splitting (electing a Republican governor in 2024 while backing the Democratic presidential candidate) and current unified GOP state government indicate the electorate is receptive to Republican candidates even in a cycle unfavorable to the national GOP brand. (https://www.newsweek.com/sununu-pappas-new-hampshire-senate-race-polls-12419856) BOTTOM LINE: The YES case rests on Sununu's unique name-brand strength, a massive and growing GOP financial advantage (~$50M+ outside spending, roughly double Democratic outside spending), character/crossover-appeal numbers among independents that outperform his horse-race deficit, and a documented narrowing trend (from Pappas+11 in early September to roughly Pappas+5 now) — all pointing to a path where turnout and late undecideds break disproportionately for Sununu in a historically swingy, ticket-splitting state. NOT FOUND: No poll since October 4 shows Sununu leading or tied; no evidence of a late-breaking scandal, debate moment, or additional institutional event specifically boosting Sununu beyond the financial and structural factors cited; early/absentee voting data by party was not available.

YES means: Republicans (John E. Sununu, the GOP nominee) win the 2026 New Hampshire U.S. Senate election outright and all three named outlets (AP, Fox News, NBC) call the race for him, or he is certified the winner. This dimension argues the strongest case for NO — i.e., that Sununu/Republicans do NOT win and Chris Pappas (D) prevails. - [2026-10-05] A NYT poll cited in TIME's reporting found Trump's job approval in NH at 60% disapproval among all voters and 65% disapproval among independents — the bloc that "normally decide elections in New Hampshire" — which Democrats hope will nationalize the race against Sununu. (https://time.com/article/2026/10/05/new-hampshire-blue-wave-republicans-sununu-pappas/) - [2026-09-23] UNH Survey Center's Granite State Poll put Trump's statewide approval at an all-time-low with only 32% approving and 67% disapproving, and strong approval cratering from 41% in 2018 to 19% in September 2026. (https://www.wcax.com/2026/09/23/trumps-approval-rating-hits-all-time-low-new-hampshire-unh-poll-finds/) - [2026-10-05] Newsweek's swing-state tracker likewise shows Trump at -35 net approval in New Hampshire, underscoring the structural headwind Sununu is running against four weeks before election day. (https://www.newsweek.com/map-trump-approval-rating-in-each-senate-swing-state-4-weeks-before-midterm-12530774) - [2026-10-05] Despite GOP optimism about Sununu's "pedigree," the same NYT poll found Pappas's 5-point lead was smaller than Democrats' 9-point edge on the generic "which party should control the Senate" question, but TIME notes this still leaves Pappas ahead, not behind, heading into the stretch. (https://time.com/article/2026/10/05/new-hampshire-blue-wave-republicans-sununu-pappas/) - [2026-10-05] Outside spending has topped $50 million in a state with fewer than 1 million registered voters, with Senate Leadership Fund ($17M), Trump-aligned No Going Back PAC ($10M) and Americans for Prosperity Action ($2M+) backing Sununu — yet none of this GOP money advantage has flipped the polling average, which has consistently shown Pappas ahead since mid-September. (https://time.com/article/2026/10/05/new-hampshire-blue-wave-republicans-sununu-pappas/) - [2026-10-05] TIME reports Pappas enjoys only a 75% satisfaction rate among Democrats as their nominee versus 85% for Sununu among Republicans — a real enthusiasm gap — but this is framed by Republicans themselves as their best (and seemingly insufficient) argument for an upset, not evidence they are currently ahead. (https://time.com/article/2026/10/05/new-hampshire-blue-wave-republicans-sununu-pappas/) - [2026-09-14] Fundraising data show Pappas with a decisive structural advantage in grassroots support: 92% of his contributions came from individual donors versus 57.5% for Sununu, and Pappas has been "lifted by labor groups" contributing roughly 20% of his PAC receipts. (https://newhampshirebulletin.com/2026/09/14/sununu-vs-pappas-where-the-candidates-stand-in-the-fundraising-battle/) - [2026-10-06] Decision Desk HQ's model (cited in colleagues' reports) already prices Republicans at just 22% to win NH, while the independent VotePredictor aggregator separately shows Pappas favored at roughly 93% with a D+6.0 projected margin, reinforcing that essentially every quantitative model — not just qualitative pundit ratings — currently favors a Democratic win. (https://votepredictor.com/states/nh) - [2025-10-22] Sununu's own campaign launch messaging emphasized a desire to "calm the waters" in a "loud, dysfunctional" Congress rather than align with Trump, an implicit acknowledgment from the start that distancing from an unpopular national GOP brand would be necessary to win in this Harris-won state. (https://www.foxnews.com/politics/former-gop-senator-emerges-from-private-sector-new-mission-somebody-has-to-step-up.print) - Historical inertia: Republicans have not won any NH Senate race since Sununu's own 2002 victory, losing the seat to Shaheen in the 2008 rematch and in every subsequent cycle (2014, 2020), so the status-quo "nothing changes" baseline favors continuation of the Democratic hold absent a late, unprecedented reversal. - With the election falling on Nov. 3, just one day before the Nov. 4 trading close, there is essentially zero time after polls close for a contested recount, litigation, or delayed certification to overturn an AP/Fox/NBC race call in Sununu's favor even if the margin narrows further — any swing toward Sununu must already be baked into pre-election dynamics, and no such decisive swing has yet appeared in any public poll. BOTTOM LINE: Every available data point — Trump's historically poor NH approval (32% in the most recent UNH poll), a consistent mid-to-high single-digit Pappas polling lead sustained since mid-September despite a GOP financial advantage exceeding $50 million in outside spending, Pappas's superior grassroots fundraising, and the unbroken 20+ year Democratic hold on this seat — supports the NO case that Republicans fail to flip New Hampshire, even though Sununu's name-brand strength keeps the race nominally competitive rather than a lopsided blowout. NOT FOUND: No evidence of any post-October-4 poll, debate, scandal, or event that has shifted the trajectory toward Sununu; no confirmation of any internal GOP polling showing Sununu actually leading (only "statistical tie" claims from a single March Emerson poll referenced retrospectively).