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Shared national swing changes odds of seven Democratic Senate wins

PredictionMarketPicks reports its 5:02 p.m. ET analysis multiplied the seven Democratic favorites in Michigan, Texas, Ohio, Alaska, Maine, Kansas and Iowa out to about 6.6 cents if the races were independent coin flips. Its simulation, which lets the races move together on one national swing, puts the chance all seven win at about 16 to 23 percent, and adding the Republican favorites in Nebraska and South Carolina drops the combined price to about 3.3 cents as independent legs and about 5 percent in the simulation.

Seven Democratic Senate favorites produce sharply different combined probabilities depending on whether their races are treated as independent or linked, according to PredictionMarketPicks. Its analysis put an all-seven outcome at about 6.6 cents under independence, versus about 16 to 23 percent in a simulation allowing the contests to move together.

Two approaches to the same seven races

The analysis, conducted at 5:02 p.m. ET and reported Nov 3, 2026 · 7:45 PM ET, covered Democratic favorites in Michigan, Texas, Ohio, Alaska, Maine, Kansas and Iowa.

PredictionMarketPicks calculated the roughly 6.6-cent figure by multiplying the seven favorites’ individual probabilities as independent outcomes. Its alternative simulation linked the races through a single national swing, yielding the higher chance that all seven Democrats win.

Adding Republican favorites changes the combination

Including the Republican favorites in Nebraska and South Carolina brought the combined independent-leg price down to about 3.3 cents, according to PredictionMarketPicks. The simulation placed that expanded combination at about 5 percent.

The comparison highlights the importance of assumptions about how Senate races move together. The simulated probability remained above the independent calculation for both combinations, but adding the two Republican favorites narrowed the difference substantially.

What it means for prediction markets

  • Dependence assumptions matter: Multiplying individual race probabilities produced about 6.6 cents for seven Democratic wins; a shared-swing simulation put the same outcome at about 16 to 23 percent.
  • The selection of outcomes matters too: Adding Republican wins in Nebraska and South Carolina reduced the estimates to about 3.3 cents under independence and about 5 percent in the simulation.
  • Model estimates are conditional: The simulation’s figures reflect its national-swing approach, rather than an assumption that each contest resolves independently.
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