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Polymarket event contracts displayed on a computer. Photo: Gabby Jones/Bloomberg via Getty Images

The Commodity Futures Trading Commission is launching a legal campaign to defend its regulatory turf on prediction markets, setting up a clash with states that have sought to block them.

Why it matters: Prediction markets like Kalshi and Polymarket have been surging in popularity, raising questions about the legality of sports event contracts and other trading opportunities in a growing gambling culture.