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Kalshi markets show Democrats and Republicans at approximately 51%/49% for Senate control — effectively a coin flip (as of approx. July 2026). The seat map is marginally favorable to Democrats: more Republican-held seats in competitive swing states are up for defense. Polymarket and Metaculus place Democrats at 78–84% for the House (a separate open prediction), implying a national wave in their direction — such momentum would have spillover effects in close Senate races. Senate and House outcomes are independent.
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Polymarket (as of July 14, 2026) gives Democrats an 85% chance of winning the House. Democrats lead the generic ballot by 5–6 points (June 2026). Historically, the incumbent's party loses ~25 House seats in midterms; Republicans hold ~220 seats, so a loss of 3–4 seats flips the majority. Headwinds for Republicans: PPI +6.2% YoY, Hormuz crisis, weak consumer sentiment. Risk: gerrymandering, possible economic recovery by November. Senate race is separate (Polymarket: 55% Republicans retain Senate).
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Polymarket shows 44% for 'Democrats win both chambers' (Sweep) and 41% for 'Republican Senate / Democratic House'. Scenarios with a Republican Senate total ~56% (41% split + ~15% Republican Sweep). Structurally, Democrats defend far more Senate seats in competitive swing states in 2026 (Georgia, Michigan, Nevada, Arizona), while Republicans face limited seat exposure. Senate map historically favors the party defending fewer seats. Polymarket anchor implies ~56% for Republican Senate retention.
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Metaculus assigns Republicans 58.9% probability of holding the most Senate seats – implying ≈41% for Democrats. Structural analysis: Republicans currently hold a 53-47 majority and must defend 22 of the 35 contested seats. Democrats need a net gain of four seats. The NYT recently upgraded Alaska from 'Lean Republican' to 'Tossup'. Democrats lead in North Carolina and Maine; Republicans hold narrow advantages in Iowa, Ohio, and Texas. Historical anti-Trump wave effect (the president's party typically loses seats in midterms) could boost chances. Headwind: the Senate map structurally favors Republicans in this specific cycle composition.
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Polymarket assigns 83–84% probability to a Democratic House majority (as of June/July 2026, active market). Historically, the president's party loses an average of 28 House seats in midterms (Roll Call analysis); the current Republican majority is only ~5 seats (c. 220–215). 270toWin and RaceToWH identify 40+ competitive districts, predominantly suburban. Democrats hold a 5–6 point generic ballot lead (as of June 2026). Dampening factors: gerrymandering, high GOP rural turnout, Iran crisis could briefly trigger a rally-around-the-flag effect. Calibration anchored to Polymarket 83% with a small discount for remaining 4-month uncertainty: 81%.
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The 2026 US midterm elections feature Class 3 Senate seats – many of which were won by Democrats in the 2020 Biden wave (including Arizona, Georgia, Nevada, Pennsylvania, Wisconsin). Republicans currently hold a Senate majority (~53:47). In mid-term cycles with opposition sentiment against the presidential party, Republicans historically perform well in Senate defense. Polymarket and Kalshi price Republicans to hold the Senate at approximately 60–65%. This prediction complements – without contradicting – the existing open forecast 'Democrats win House majority' (a separate chamber).
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Polymarket gives Republicans 57.5% and Kalshi ~52% odds to retain the Senate majority. Despite rising disapproval over Trump's economic policy and the war in Iran, Democrats face a difficult map: of 34 seats up for election, many are in Republican-leaning terrain. CNN identifies 9 likely flip seats – Democrats would need nearly all of them. Market average: ~55% for Republicans. Source: Polymarket / Kalshi / Decrypt, as of July 2026.
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Markets are currently split: Polymarket sees ~58% for a Republican Senate majority, Kalshi sees ~49% (as of July 2026) — average ~53%. Democrats defend many Class 2 seats won in 2020 (Gary Peters/MI, John Hickenlooper/CO, Mark Warner/VA, Jeanne Shaheen/NH). Strongest Republican individual race: Texas (Paxton ~58%). Elevated oil prices (Brent ~USD 97, 24.7.2026), inflation concerns, and tariff burdens create a mixed midterm environment. Prediction anchors on Polymarket's 58% reading, discounted slightly for Kalshi divergence.
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Polymarket rates Democrats as clear favourites to control the House after the 2026 midterms (trade volume: USD 8.7M as of July 21, 2026). Generic-ballot polls show a 5–6-point Democratic lead (June 2026). Historically, the president's party loses ~26 House seats at midterms; Republicans hold a narrow majority and would need to limit losses to single digits. All 435 seats are up. Note: Democratic Senate majority is already a separate platform prediction; the House is a distinct contest.
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Polymarket assigns 83% probability to Democratic control of the House as of July 12, 2026. The Democratic generic ballot lead stands at 5–6 points in June 2026 polls, consistent with historical midterm patterns under Republican presidents. Historically, the president's party loses an average of 26 House seats — Democrats would need fewer than ~20 net gains. Gerrymandering could dampen the effect. This scenario (Democrats in the House, Republicans in the Senate) would be a classic split Congress — consistent with the open platform prediction that Republicans retain the Senate.
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Republicans hold a razor-thin majority in the House (~220 to ~215 seats, 119th Congress). The One Big Beautiful Bill Act (signed July 4, 2025, passed 218-214) contains deeply controversial Medicaid cuts and food assistance reductions — a classic opposition mobilization issue. Historically, the president's party loses an average of 25–30 House seats in midterms (six of the last eight midterms). With only a 5-seat majority, losing just 3 seats flips the chamber. Dampening factors: Republican gerrymandering, incumbency advantages. Note: this prediction refers to the House; Republican Senate majority is captured as a separate existing open prediction. No Polymarket signal for the House specifically available.
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Polymarket and Kalshi now give Democrats a slight edge for Senate control in 2026: 51% Democrats vs. 49% Republicans (as of July 22, 2026). As recently as June 2026, Republicans led at ~58% on Kalshi. The dramatic reversal reflects escalating Iran/Middle East tensions, a Democratic generic ballot lead, and polling advantages in swing states — Georgia Senator Jon Ossoff holds a clear lead in current polls. 35 Senate seats are up in 2026, 23 currently held by Republicans. This prediction covers the Senate and is separate from the already-open House prediction (also favouring Democrats).
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Polymarket assigns a 56.5% probability to Republicans retaining the Senate majority at the US midterms on November 3, 2026. Of the 35 seats up, Republicans defend 22; Democrats need a net gain of 4 for a majority. Maine is the key swing state (Polymarket: 64% Democrats). Despite the Trump administration's budget reconciliation success (Senate passage early July 2026, VP Vance tie-breaking vote), the political landscape remains polarized; inflation (CPI 4.2% YoY) and Iran-conflict energy price pressure are headwinds. Polymarket sees 56.5% GOP; own calibration without deviation: 57%.
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Kalshi gives Milwaukee County Executive David Crowley 79%, Republican Tom Tiffany 22% (as of October 26, 2026). RealClearPolling average (4 polls): Crowley +3.5 percentage points. Marquette Law School Poll September 2026: Crowley 49%, Tiffany 46% among likely voters — the tightest individual survey. National backing: Kalshi gives Democrats 91% for the House and 64% for the Senate; Wisconsin governor's race follows the party momentum. Tiffany raised more money ($26.3M vs. $10.2M) but failed to build a polling lead. All sources — markets and polls — are consistently pro-Crowley.
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Sherrod Brown challenges incumbent Jon Husted (appointed by Governor DeWine to fill JD Vance's vacated seat). Polymarket gives Brown 71%, Husted 31% ($1.87M traded as of October 27, 2026). Kalshi shows Brown 68%, Decision Desk HQ 56%. RCP polling average: Brown +3.3 points. Individual polls show Brown +5 (Fox News) and +6 (Cook/Bowling Green); only Rasmussen (10/12–10/14) shows Husted +2. Brown's personal favorability, strength with union households, independents, and women provide structural advantage despite Ohio's rightward shift (Trump +11, 2024).
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Kalshi projects a full Democratic congressional sweep at 64%; Democratic House + Republican Senate at 28%. Implied P(Democratic Senate) ≈ 64% ÷ 92% (Polymarket House) ≈ 70%. Polymarket sees 92.5% for Democrats winning House majority. Kalshi's model projects net seat gains in Ohio (Sherrod Brown), Michigan (Abdul El-Sayed), and through favorable shifts in Nevada and Arizona. Democrats need a net 2–3 seat gain. Polymarket shows $1.99M in 24-hour House-contract volume — deeply liquid, well-calibrated market. Main risk: upset results in individual Senate races (Texas, Montana, Florida) could reverse the swing.
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Polymarket puts Cooper at 97%, Kalshi likewise 97%. The former two-term governor of North Carolina runs for the open Senate seat following Thom Tillis's (R) retirement. Polling average October 2026: Cooper leads +8 to +14 points over Whatley. Polymarket and Kalshi briefly diverged (Polymarket 73% in January) but converged to ~97% by October. Markets treat this seat as near-certainly Democratic.
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Polymarket shows Ford at 79%, Kalshi at 75% — despite polls showing an essentially tied race (PollCheck average Oct 29: Ford +1.2; RCP average Oct 7-13: Lombardo +1.5). The market-polling divergence is striking: prediction markets are betting much more heavily on Ford than polls justify. Background: Lombardo was the market favorite through August/September; Ford surged past 75% in October. Structurally, Ford benefits from a strongly Democratic campaign environment in Nevada and the absence of a clear Republican momentum signal. No open Nevada Governor prediction in the database. Confirmed via AP or NBC News by November 4, 2026.
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Polymarket shows Bottoms at 61–63%, Kalshi similarly — despite the RealClearPolling average (5 polls) showing Jackson narrowly ahead by +1.2 points. The divergence between markets and polls is unusually wide, likely pricing in structural early-vote strength for Democrats and demographic shifts in Metro Atlanta. Bottoms would be Georgia's first Black governor; Jackson runs without incumbency. Anchor: Polymarket ~62% for Bottoms.
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Polymarket prices Adam Hamilton (D) at 62% vs. incumbent Roger Marshall (R) at 39% — trading volume $2M (November 2, 2026). Kansas is traditionally a Republican stronghold, but the national Democratic wave (Polymarket Senate majority D: 73%, House majority D: 95%; Decision Desk HQ: Democrats 84% House) lifts competitive races like this. Silver Bulletin and Decision Desk HQ classify Kansas as contested. Probability kept at the Polymarket anchor of 62%, as market volume remains moderate despite national momentum.