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Will the Republicans win the Wisconsin governor race in 2026?

0xd66eadbd64b3e815e31c7994470b44fe15c7ef1146f78937d0cfaa4c04fcfda7 · Elections · 2026-08-20
26%
Agent
24%
Market Price
+2.5%
Edge
62%
Confidence
Volume: 184,796
Spread: 1.0c
Days to resolution: 74
Markets in event: 13
Final Rationale
The best available market anchor (Polymarket 23.5% YES) converges with an independent base-rate/polling blend model at 23–26%, and both post-primary polls (Crowley +3 to +4) and the national environment (generic ballot D+5–8, Trump net approval ~-20) point toward a Democratic hold, as does the ~77% out-party success rate in open-seat midterm swing-state governor races and Wisconsin's 2025 D+10 Supreme Court result. Counterweights are real: Wisconsin's near-even partisan baseline (2024 R+0.9), Tiffany's large cash advantage and 7-figure ad blitz, and Crowley's narrow 39.8% upset primary win with low statewide name ID — all of which justify a Republican probability meaningfully above the 15% level. The critique is right that the Polymarket anchor is thin and that ~11 weeks of unmodeled campaign dynamics remain, which argues for slightly more probability on the trailing side rather than tighter concentration; that pushes me marginally above the raw market price. Resolution-timing quibbles don't change the binary allocation since eventual certification resolves it either way. Final: 26% Yes / 74% No, essentially the consensus with a small upward tilt for staleness and money asymmetry.
Price vs. prediction
How the market moved after the agent's call. Solid blue line is the actual market price; dashed line is the agent's static forecast at $t{=}0$.
$n = 14$ follow-ups
Re-scan Context
This market has been scanned before. Previous predictions:
DatePredictedMarket PriceConfidence
2026-08-13 26% 22% 59%
1. Planner Opus · Fermi decomposition + tool plan
Tools chosen: polymarket_direct kalshi_related polymarket_related claude_news claude_news gdelt_news wikipedia code_execution
Sub-questions (Fermi decomposition)
  1. What is the current Polymarket price for Republicans winning the 2026 Wisconsin governor race, and how has it moved over the past 90 days?
  2. What does Kalshi (or other venues) price for the same race, and is there a cross-venue disagreement?
  3. Who are the leading Democratic and Republican primary candidates (e.g., Rodriguez, Crowley, Roys vs. Tiffany, Berrien, Schoemann), and what are the August 2026 primary dynamics?
  4. What do recent head-to-head and generic-ballot polls of Wisconsin show for the 2026 governor race?
  5. What is the base rate for the out-party (non-presidential party) winning open-seat governorships in swing states during midterms, and what were recent Wisconsin statewide margins (2018, 2022 gov; 2024 pres; 2025 Supreme Court)?
  6. What is the current national political environment (Trump approval, generic congressional ballot, 2025 off-year election results) and how does it tilt a Wisconsin toss-up?
Planner reasoning
This is a Polymarket election question on an open-seat 2026 Wisconsin gubernatorial race (Evers retiring), so the Polymarket price is the primary anchor, cross-checked against Kalshi. Key drivers are the candidate fields in both primaries, early general-election polling, Wisconsin's partisan lean/history of narrow margins, and the national midterm environment (Democratic-favorable so far in 2025 off-year results).
2. Research Parallel tool calls
ToolStatusTimeItemsSummary
polymarket_direct OK 0.4s 1 ## This Market's Polymarket Data **Will the Republicans win the Wisconsin governor race in 2026?** - Current price (probability): 23.50% - 7-day price change: +0.00% - 30-day price change: -18.00% - Total volume: $184,796 (USD notional) - Price range: 13.50% - 59.50% - Data points: 120 days
kalshi_related OK 2.1s 2 2 related markets / summaries. keyword 'Wisconsin governor': ok | keyword 'governor 2026': ok
polymarket_related OK 0.1s 0 Scanned 100 active Polymarket markets, kept 0 matches. keyword 'Wisconsin governor': 0 markets | keyword '2026 governor': 0 markets | keyword 'Wisconsin': 0 markets
claude_news OK 31.2s 21 ## Key Findings: 2026 Wisconsin Governor Race - **Primaries are complete (Aug 11, 2026):** Tom Tiffany won the GOP nomination after Bill Berrien withdrew from the race Republican candidate Bill Berrien abruptly ended his campaign following controversies over his past social-media activity . On the
claude_news OK 24.5s 13 ## Key Findings **Wisconsin Governor Race Specifics** - The general election matchup is set: Democrat David Crowley and Republican Tom Tiffany will face each other on the ballot in November. Crowley won a contested Democratic primary while Tiffany defeated Andy Manske for the GOP nod. (wuwm.com)
gdelt_news OK 76.9s 36 GDELT: 36 articles across 3 queries (lookback=45d). 'Wisconsin governor 2026 poll': 12 hits | 'Tiffany Rodriguez Wisconsin governor': 12 hits | 'Wisconsin gubernatorial race 2026': 12 hits
wikipedia OK 0.1s 4 Fetched 4 Wikipedia entries (0 missing pages).
code_execution OK 115.1s 0 ## Key Findings **Historical base rate (open-seat swing-state governor races, midterms since 1994):** - Identified 26 open-seat gubernatorial races in traditionally swing states (PA, OH, MI, WI, FL, NV, AZ, CO, NM, ME, GA, AR) across the 1994–2022 midterm cycles. - The party **not** holding the Whi
3. Evidence Brief Sonnet · 7401 chars
# Current state The Aug 11, 2026 primaries are complete: Tom Tiffany (R) faces David Crowley (D) in the Nov 3, 2026 general election. Current public polling and forecast models show Crowley with a modest lead (D+1 to D+4), rated "Lean/Tilt Democratic," while Tiffany holds a substantial fundraising edge. No outcome has been called; the market tracks the eventual AP/Fox/NBC race call or certification. # Timeline of key events - 2025-04 (confirmed): Wisconsin Supreme Court race won by liberal-aligned candidate Susan Crawford by ~D+10, an early Democratic-favorable signal. - 2025-10-29 (confirmed): Marquette Law School poll shows most voters undecided/unfamiliar with 2026 candidates (64% undecided GOP primary, 73% Dem primary); Tiffany best-known Republican. - 2025-11 (confirmed, per background): Democrats won VA and NJ governorships, reinforcing favorable D environment. - 2026-07-13 (confirmed): Lt. Gov. Sara Rodriguez fires campaign manager over inaccurate finance filings; campaign stumbles. - 2026-07-16/17 (confirmed): Tiffany reports ~$8.7–9M raised (mostly WI GOP transfers); each Democrat under $1M. - 2026-07-18 (confirmed): David Crowley re-enters race with Evers' endorsement after brief withdrawal. - 2026-07-22 (reported): Polling shows tight, fluid Democratic primary; Kelda Roys surges in one poll. - 2026-07-28 to 08-05 (reported): Francesca Hong surges in Marquette poll, then faces backlash over "cancel Thanksgiving" and "old white people" remarks. - 2026-07-31 (confirmed): Mandela Barnes drops out of the race. - 2026-08-11 (confirmed): Primaries held — Tiffany wins GOP nod (Berrien withdrew earlier amid social-media controversy); Crowley wins Democratic primary (39.8%) upsetting Hong in a "razor-thin"/upset race. - 2026-08-13 (confirmed): Platform Comms poll: Crowley 48%, Tiffany 44%. - 2026-08 (reported): General-election ad war begins; Tiffany funds 7-figure ad campaign attacking Crowley; Crowley raises $1.5M in first 24 hours post-primary. - 2026-08-18/19 (reported): National environment data shows Trump approval near record lows (-20 net), generic ballot D+5 to +8. # Event Kalshi binary market: will the Republican nominee win the 2026 Wisconsin gubernatorial election (resolved by AP/Fox/NBC call or certification). # Outcomes to forecast - Yes (Republican/Tiffany wins) - No (Democrat/Crowley or other wins) # Kalshi market anchor No direct Kalshi price was returned for this specific ticker in the raw research; only Polymarket data available for this exact market. Polymarket price (best available cross-venue anchor): **23.5% YES (Republican win)**, flat over 7 days, down 18pts over 30 days, range 13.5%–59.5% over 120 days, $184.8K volume — suggesting the market swung wildly during primary season and has since settled lower, likely reflecting Crowley's primary win and favorable D polling. # Sub-question answers 1. **Polymarket price/90-day move** — Currently 23.5%; down sharply (-18pts in 30 days) from a high of 59.5%, likely reflecting resolution of primary uncertainty and Crowley's stronger-than-expected primary performance. [polymarket_direct] 2. **Kalshi/cross-venue pricing** — No direct Kalshi price for this ticker found; only analogous unrelated state markets (WV-R 87%, MO-R 93.4%) returned, not comparable. No cross-venue disagreement data available for WI specifically. [kalshi_related] 3. **Primary dynamics/candidates** — Tiffany (R) won uncontested after Berrien withdrew; Crowley (D) upset Hong 39.8%-to-second in a "razor-thin"/surprise outcome after briefly withdrawing and being re-endorsed by Evers; Rodriguez and Barnes exited earlier. [claude_news, wikipedia, gdelt_news] 4. **Head-to-head polls** — PollingSource average: Crowley 47% vs Tiffany 43.8% (D+3.2); most recent poll (Aug 13) Crowley 48%–Tiffany 44%; Pollsmax model gives Crowley 54.5% win probability (50.5%-49.6% vote share). [claude_news] 5. **Base rates/WI margins** — Out-party won 76.9% of open-seat swing-state governor races in midterms since 1994 (implies ~77% D win base rate given GOP holds WH). WI margins: 2018 Gov D+1.1, 2022 Gov D+3.4, 2024 Pres R+0.9, 2025 Supreme Court D+10. Blended quantitative model: P(R wins) ≈ 23–26%. [code_execution] 6. **National environment** — Generic ballot D+5 to +8 (RCP, Silver Bulletin, DDHQ, PollingSource); Trump net approval ~-20 (multiple trackers, Aug 2026), historically weak for a midterm year, favoring Democrats. [claude_news] # Key facts (high-confidence, factual) 1. [wikipedia] Tiffany (R) and Crowley (D) are confirmed general-election nominees; primary held Aug 11, 2026. 2. [claude_news] Tiffany has major fundraising advantage (~$8.7-9M raised, ~$5M cash on hand by end of July) vs. Crowley's slower Democratic fundraising pre-primary but strong post-primary surge ($1.5M in 24 hrs). 3. [code_execution] WI 2025 Supreme Court race was D+10; 2024 presidential was R+0.9; 2022/2018 governor races were D-won by 3.4/1.1. 4. [claude_news] National generic ballot and Trump approval both point to a favorable Democratic midterm environment. # Cross-market signals - Kalshi related: No directly comparable state markets found; irrelevant WV/MO GOP markets returned (87-93% R, non-competitive states). - Polymarket: 23.5% YES (R), down significantly from spring/summer highs near 60%, consistent with post-primary Democratic polling lead. - Sportsbook implied: None found. # Analyst opinions and speculation - Pollsmax forecast: Crowley 54.5% win probability, "Tilt Democratic." - PollingSource: "Lean D... competitive." - Some commentary (Pollsmax note per claude_news) flags belief that "Republicans are expected to narrowly flip" despite current D-leaning polls — indicating model disagreement/uncertainty. - Townhall (partisan-leaning outlet) claimed "polls favor [Tiffany] to win in November" (July 22, pre-primary), likely outdated/opinion-driven. # Directional lean per outcome - **Yes (R/Tiffany)**: Supported by fundraising advantage, ad-spending dominance, weak WI partisan tilt (2024 pres near-even), historical GOP legislative strength. Opposed by current polling deficit (D+3-4), unfavorable national environment (generic ballot D+5-8, Trump approval -20), 2025 Supreme Court blowout, and historical out-party base rate (~77% favoring Democrats in open-seat midterm swing races). - **No (D/Crowley)**: Supported by consistent post-primary polling lead, favorable national environment, historical base rate, 2025 special election trends. Opposed by Tiffany's cash advantage, Crowley's primary being an "upset"/lower-name-recognition win, and possible late-campaign volatility. # Gaps / unknowns - No direct Kalshi YES price for this specific ticker was retrieved; anchor relies on Polymarket only. - No polling data from September–November 2026 (closer to election) available; state as of mid-August 2026. - Uncertainty on turnout/undecided voter behavior given low name recognition noted in Oct 2025 Marquette poll. # Calibration anchors - Polymarket YES (R) price: 23.5% (best available direct market anchor; no Kalshi-specific price found). - Quantitative base-rate model: ~23-26% P(R wins). - Polling average: D+3.2 to D+4 (implies R win probability roughly in 30-45% range using typical polling error, though model consensus centers near mid-to-high 20s%). - Precedent: 2018 and 2022 WI governor races both resolved for Democrats despite competitive pre-election polling.
4. Forecasters Opus + GPT · in parallel
claude-opus-5
0.60
Yes 25%
No 75%
The best available market anchor (Polymarket, 23.5% YES for a Republican win) aligns closely with a base-rate/polling blend model at 23-26%, and with post-primary polling showing Crowley +3 to +4 (Aug 13: 48-44) and Pollsmax rating the race Tilt/Lean Democratic. The national environment is strongly pro-Democratic (generic ballot D+5 to +8, Trump net approval ~-20), and Wisconsin's recent statewide behavior (2025 Supreme Court D+10, 2018/2022 gubernatorial D wins) plus the ~77% out-party success rate in open-seat midterm swing-state governor races all reinforce the Democratic lean. Offsetting factors — Tiffany's large cash advantage (~$8.7-9M, ~$5M cash on hand), Crowley's narrow 39.8% primary win and limited name recognition, and Wisconsin's essentially even partisan baseline (2024 R+0.9) — justify keeping the Republican probability meaningfully above 15% rather than dismissing it. I nudge slightly above the 23.5% anchor to ~25% given the mid-August data staleness and the fundraising/name-ID asymmetry that could tighten the race.
gpt-5.5
0.64
Yes 27%
No 73%
The best direct market anchor is Polymarket at 23.5% YES, and the quantitative base-rate model independently lands near 23–26% Republican win probability. The primary evidence points toward No: Crowley leads post-primary polling by about D+3 to D+4, Wisconsin’s 2025 Supreme Court race was D+10, and the national environment is strongly Democratic with generic ballot D+5 to D+8 and Trump approval around -20. Tiffany’s large fundraising edge and Wisconsin’s very competitive baseline, including Trump’s 2024 R+0.9 win, point toward Yes and justify moving slightly above the 23.5% market anchor. Overall, the race is competitive but currently more likely to remain Democratic than flip Republican.
5. Devil's Advocate Sonnet · red-team critique
1. Both forecasts nudge slightly above the 23.5% Polymarket anchor citing "data staleness" and fundraising, but neither grapples with the fact that Polymarket itself is a thin, possibly stale/illiquid market (only $184.8K volume, no Kalshi-specific price) — treating it as a hard anchor rather than a noisy signal may be over-trusting a low-liquidity secondary market. 2. Neither forecast addresses the gap noted in the brief: "No polling data from September–November 2026... available; state as of mid-August 2026" — nearly three months of campaign dynamics (ad wars, debates, October surprises) are unaccounted for, yet both settle on a narrow 25-27% range as if little could change. 3. Both forecasts underweight the Pollsmax model disagreement flagged in the brief — "Pollsmax note... flags belief that 'Republicans are expected to narrowly flip' despite current D-leaning polls" — this internal model contradiction (Pollsmax gives Crowley 54.5% win probability yet also reportedly expects a GOP flip) suggests genuine uncertainty in quantitative models that neither forecaster explored or reconciled. 4. Crowley's primary win is described as an "upset"/"razor-thin" with only 39.8% of the vote against a stronger-performing Hong, and Democratic fundraising remains far behind Tiffany's — both forecasts mention this but don't meaningfully adjust for the risk that a weaker, lower-name-recognition nominee with a cash disadvantage could underperform current polling averages more than typical incumbent-quality candidates, especially with fundraising gaps historically correlating with late movement. 5. Both anchor tightly to the 23-26% band without acknowledging the wide historical range in the Polymarket price itself (13.5%-59.5% over 120 days) — this volatility suggests genuine tail risk/uncertainty that a point estimate near 25% may understate; neither forecaster discusses scenario planning (e.g., a Tiffany ad-spending blitz closing the gap, or a further Democratic wave pushing this toward single digits). 6. Neither forecast discusses the possibility of the race resolving as "too early to call" complications or unusual certification delays given the binary's resolution criteria (AP/Fox/NBC call or certification), which in a closer race (D+3-4 polling) could introduce non-trivial timing/resolution risk not captured in a simple Yes/No probability split.
6. Aggregator Opus · final calibrated forecast
26% (62% confidence)
Yes: 26% No: 74%
The best available market anchor (Polymarket 23.5% YES) converges with an independent base-rate/polling blend model at 23–26%, and both post-primary polls (Crowley +3 to +4) and the national environment (generic ballot D+5–8, Trump net approval ~-20) point toward a Democratic hold, as does the ~77% out-party success rate in open-seat midterm swing-state governor races and Wisconsin's 2025 D+10 Supreme Court result. Counterweights are real: Wisconsin's near-even partisan baseline (2024 R+0.9), Tiffany's large cash advantage and 7-figure ad blitz, and Crowley's narrow 39.8% upset primary win with low statewide name ID — all of which justify a Republican probability meaningfully above the 15% level. The critique is right that the Polymarket anchor is thin and that ~11 weeks of unmodeled campaign dynamics remain, which argues for slightly more probability on the trailing side rather than tighter concentration; that pushes me marginally above the raw market price. Resolution-timing quibbles don't change the binary allocation since eventual certification resolves it either way. Final: 26% Yes / 74% No, essentially the consensus with a small upward tilt for staleness and money asymmetry.
Pipeline Timing
Total pipeline time: 199.3s
Per-tool research timings shown in the Research section above.