Kalshi Senate odds show a gap between races and control

A consistency check by DeFi Rate found that combining prices for 35 individual Kalshi Senate races produces a 96 percent implied probability of Democratic control—if the contests are treated as independent.

That compares with an 87 percent average in the control markets themselves, according to DeFi Rate. The findings, published Nov 3, 2026 at 7:30 PM ET, put the two readings nine percentage points apart.

The assumption behind the difference

The central limitation is the calculation’s independence assumption. As DeFi Rate notes, Senate contests are not independent: a shared national swing tends to move races together.

The 96 percent figure therefore represents the result of that assumption, rather than a direct market price for Democratic Senate control. The 87 percent figure, by contrast, comes from the control markets themselves.

For readers comparing the two, the distinction matters. The gap alone does not establish that either set of prices is wrong; the race-by-race calculation leaves out the relationship between outcomes that DeFi Rate identifies.

What it means for prediction markets

• Aggregation depends on assumptions: Combining 35 race prices yields 96 percent only under the stated independence assumption.
• Related outcomes complicate comparisons: A national swing can affect several Senate races together, limiting what an independent-race calculation can show.
• The gap is not proof of mispricing: The nine-percentage-point difference flags a consistency question, but does not resolve it without accounting for how races move together.