Brazil forecasting miss puts Kalshi under scrutiny before US midterms
Kalshi's own post-election accounting put its Brazil miss at about 7 points on the margin, against about 5.6 points for the final polls, after Lula won 51.79 percent to 48.21 percent. Ahead of Tuesday's midterms, Democratic control of the Senate traded at 70 cents on Kalshi on Friday morning, with more than 114 million dollars traded on that question alone.
Kalshi’s Brazil election performance is drawing attention ahead of Tuesday’s US midterms. Flavio Bolsonaro was priced at nearly 80 percent when polls closed, but Lula won, according to The Center Square.
Lula finished with 51.79 percent of the vote against 48.21 percent for Bolsonaro. Kalshi’s own post-election assessment measured its error on the margin at about 7 points, compared with about 5.6 points for the final polls, according to the outlet.
Senate trading becomes the next test
The focus now shifts to US congressional control. On Friday morning, contracts for Democratic control of the Senate traded at 70 cents on Kalshi, The Center Square reported.
More than 114 million dollars had been traded on that question alone. That activity makes the Senate contract a prominent test of market expectations, though trading volume is distinct from forecasting accuracy. Brazil also highlights the importance of separating a candidate’s market-implied chance of winning from an estimate of the eventual vote margin.
What it means for prediction markets
- A strong favorite can still lose. Bolsonaro’s nearly 80 percent pricing at poll close did not match the eventual winner; such pricing represents uncertainty, not a guaranteed outcome.
- The available comparison favors the polls. Kalshi’s reported margin error of about 7 points exceeded the final polls’ roughly 5.6-point error in Brazil.
- Timing matters for the next comparison. The Senate’s 70-cent price is a Friday-morning snapshot ahead of Tuesday’s midterms, not a closing assessment.
Sources & attribution
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