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Florida forecast gives Democrats Senate edge but trails market odds

Election Lab reports its final blended forecast, built from 20,000 simulated elections, gives Democrats a 70.1 percent chance of Senate control, with prediction markets weighted at only 20 percent against polls at 35 percent, fundamentals at 25 percent and expert ratings at 20 percent. Its simulation centres on 52 Democratic Senate seats and 234 Democratic House seats.

The University of Florida Election Lab’s final blended forecast assigns Democrats a 70.1 percent probability of controlling the Senate, according to Election Lab. That estimate is below the market price, placing the model and prediction markets on different levels of confidence in the same outcome.

The report, published Nov 3, 2026, at 8:15 PM ET, draws on 20,000 simulated elections. Its simulation centres on 52 Democratic Senate seats and 234 Democratic House seats.

How the forecast balances its inputs

According to Election Lab, polls carry the largest weight in the forecast at 35 percent, followed by fundamentals at 25 percent. Expert ratings and prediction markets each account for 20 percent.

The forecast therefore incorporates market pricing without allowing it to dominate the result. Its 70.1 percent Senate-control estimate is a blended assessment, rather than a forecast derived solely from polling or an independent check that excludes markets.

What it means for prediction markets

  • A lower benchmark, not an opposite call: The model favours Democratic Senate control, but with less confidence than the market price described in the report.
  • The comparison is partly interconnected: Prediction markets supply 20 percent of the forecast’s weight, so the model-market gap is not a comparison between wholly separate signals.
  • The gap cannot be quantified from the supplied figures: No exact market price is provided, preventing a precise calculation of its distance from 70.1 percent.
  • Seat totals and control probabilities are distinct: The simulation centres of 52 Democratic Senate seats and 234 Democratic House seats should not be treated as guaranteed results.
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    Election Lab
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