NPR: “For this campaign staffer, the method was simple. First, they’d receive a tip on an unreleased poll and compare it with the odds on a prediction market, like PredictIt or Polymarket. If the poll reported their candidate had a better chance of winning than the prediction markets, they’d use this edge to buy low-cost odds on their candidate — known as event contracts — before the poll was released.” “On prediction markets, the price of an ev…