Races · Governor · 2026 · WI
Governor · open seat

Mandela Barnes vs Tom Tiffany

Tossup R +0.2 · 176 days to election · 7 polls · 4 markets Last poll 52d ago Markets 4d ago Rating 1d ago
Where this race stands
Verified

Tossup · model 52% R · market gap 31pp

tossup · high-tipping · trending-d · uncertainty-medium · market-disagreement-large
Forecast · poliagg-v8
Predicted final margin
R +0.2
80% CI: R +4.6D +4.2 · win prob 48%
R+30R+15TIEDD+15D+30
Quality · inputs
Data quality · high
Polls used7
Days to election181
Residual σ3.44pt
Generated5/6/2026
Compare with other models3 models
qgbt-v1GBT (qgbt)
R +0.9
80% CI R +7.7D +1.0
CV MAE 7.21
bayes-v1Bayes / Kalman
D +1.3
80% CI R +0.4D +2.9
CV MAE 1.26
poliagg-v8Ensemble (production)
R +0.2
80% CI R +4.6D +4.2
CV MAE 3.44

Polling average

Simple Weighted House-corrected Trimmed LOESS Kalman
Method:Weighted, plus each pollster's measured bias subtracted before averaging.
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All polls · 7 results

7 of 7 polls
EndPollsterWeightLeanSampleMoEPopTrust signalsResultsSource
3/19/2026TIPP Insights1.00R1175±2.9LV
commissioned by R-aligned: Internal R-alignedno scored polls+3
  • commissioned by R-aligned: Internal R-aligned
    This poll was commissioned by a Republican-aligned committee, party, or PAC (Internal R-aligned). Such polls historically lean toward their sponsor.
  • no scored polls
    Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured.
  • uncorrelated with editorial consensus
    Across 7 historical paired polls, this pollster's margins don't track the editorial consensus (Pearson r < 0.5). Independence from consensus is informational — could indicate genuine methodological independence or noisy results.
  • ✓ verified 5d ago
    auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched.
  • likely-voter screen
    Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
Mandela Barnes 43.0 · Tom Tiffany 41.0pollarch
3/19/2026TIPP Insights1.00R1175±2.9LV
commissioned by R-aligned: Internal R-alignedno scored polls+3
  • commissioned by R-aligned: Internal R-aligned
    This poll was commissioned by a Republican-aligned committee, party, or PAC (Internal R-aligned). Such polls historically lean toward their sponsor.
  • no scored polls
    Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured.
  • uncorrelated with editorial consensus
    Across 7 historical paired polls, this pollster's margins don't track the editorial consensus (Pearson r < 0.5). Independence from consensus is informational — could indicate genuine methodological independence or noisy results.
  • ✓ verified 5d ago
    auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched.
  • likely-voter screen
    Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
David Crowley 42.0 · Tom Tiffany 41.0pollarch
3/19/2026TIPP Insights1.00R1175±2.9LV
commissioned by R-aligned: Internal R-alignedno scored polls+3
  • commissioned by R-aligned: Internal R-aligned
    This poll was commissioned by a Republican-aligned committee, party, or PAC (Internal R-aligned). Such polls historically lean toward their sponsor.
  • no scored polls
    Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured.
  • uncorrelated with editorial consensus
    Across 7 historical paired polls, this pollster's margins don't track the editorial consensus (Pearson r < 0.5). Independence from consensus is informational — could indicate genuine methodological independence or noisy results.
  • ✓ verified 5d ago
    auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched.
  • likely-voter screen
    Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
Francesca Hong 40.0 · Tom Tiffany 43.0pollarch
3/19/2026TIPP Insights1.00R1175±2.9LV
commissioned by R-aligned: Internal R-alignedno scored polls+3
  • commissioned by R-aligned: Internal R-aligned
    This poll was commissioned by a Republican-aligned committee, party, or PAC (Internal R-aligned). Such polls historically lean toward their sponsor.
  • no scored polls
    Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured.
  • uncorrelated with editorial consensus
    Across 7 historical paired polls, this pollster's margins don't track the editorial consensus (Pearson r < 0.5). Independence from consensus is informational — could indicate genuine methodological independence or noisy results.
  • ✓ verified 5d ago
    auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched.
  • likely-voter screen
    Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
Sara Rodriguez 44.0 · Tom Tiffany 41.0pollarch
3/16/2026Patriot Polling1.37R(R+1.4)812±3.5LV
commissioned by R-aligned: Internal R-aligned✓ verified 5d ago+2
  • commissioned by R-aligned: Internal R-aligned
    This poll was commissioned by a Republican-aligned committee, party, or PAC (Internal R-aligned). Such polls historically lean toward their sponsor.
  • ✓ verified 5d ago
    auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched.
  • likely-voter screen
    Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
  • bias R+1.4pt
    Across 10 historical scored polls the average error vs. actual margin is R+1.4pt.
Francesca Hong 42.0 · Tom Tiffany 46.0pollarch
10/8/2025Impact Research1.00L500±4.4LV
commissioned by D-aligned: Internal D-alignedno scored polls+4
  • commissioned by D-aligned: Internal D-aligned
    This poll was commissioned by a Democratic-aligned committee, party, or PAC (Internal D-aligned). Such polls historically lean toward their sponsor.
  • no scored polls
    Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured.
  • 214d old
    Poll was fielded 214 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average.
  • uncorrelated with editorial consensus
    Across 30 historical paired polls, this pollster's margins don't track the editorial consensus (Pearson r < 0.5). Independence from consensus is informational — could indicate genuine methodological independence or noisy results.
  • ✓ verified 5d ago
    auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched.
  • likely-voter screen
    Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
Mandela Barnes 50.0 · Tom Tiffany 44.0pollarch
10/8/2025Impact Research1.00L500±4.4LV
commissioned by D-aligned: Internal D-alignedno scored polls+4
  • commissioned by D-aligned: Internal D-aligned
    This poll was commissioned by a Democratic-aligned committee, party, or PAC (Internal D-aligned). Such polls historically lean toward their sponsor.
  • no scored polls
    Pollster has no historical polls with a known outcome in our database, so accuracy and bias cannot be measured.
  • 214d old
    Poll was fielded 214 days ago. Older polls reflect an earlier state of the race and are weighted down in the rolling average.
  • uncorrelated with editorial consensus
    Across 30 historical paired polls, this pollster's margins don't track the editorial consensus (Pearson r < 0.5). Independence from consensus is informational — could indicate genuine methodological independence or noisy results.
  • ✓ verified 5d ago
    auto-checked on 5/4/2026. Deterministic checks confirmed bounds + structure (percentages in [0,100], totals plausibly close to 100%, dates ordered). Source page itself was not re-fetched.
  • likely-voter screen
    Likely-voter screen — pollster filters respondents by reported turnout intent. Generally tighter for predicting elections than registered- or adult-population polls.
Mandela Barnes 51.0 · Tim Michels 44.0pollarch

Trust signals are deterministic flags computed from the pollster scorecard (track-record size, historical bias, aggregation weight) and the poll itself (sample size, population, age, citation availability). No interpretation; click any row to see the cited numbers behind each flag.

Editorial ratings · poll-vs-rater

3 raters
Rater Rating Updated Poll D-marg. Rater marg. Δ poll−rater
The Cook Political Report Tossup Sep 11 -0.2 0.0 -0.2
Inside Elections Tossup Aug 28 -0.2 0.0 -0.2
Sabato's Crystal Ball Tossup Sep 4 -0.2 0.0 -0.2

Δ POLL−RATER = polling-consensus margin minus the rater's implied bucket midpoint. Positive = polls more D than rater; negative = rater more D than polls. |Δ| < 0.6 well-aligned · 0.6–1.5 mild divergence · ≥1.5 contested call.

last poll 7 weeks ago (3/19/2026) last market quote 4 days ago rating computed 1 day ago
Rating history (1 change)
  • 5/3/2026 Tossup R+0.2 via polls