Crypto bettors on Polymarket, a cryptocurrency-based prediction market, say former President Joe Biden’s chances of dropping out of the 2024 presidential race have surged by 50%. What Happened: Biden’s chances to officially announce his withdrawal or confirm to have withdrawn shot up from 19% on Thursday to 30% at the time of writing. The market rules specify that “any extenuating circumstances that prevent Joe Biden from continuing the race” would also resolve bets on the president’s withdrawal to “yes.” Market participants have traded $350,000 on the question, a far cry from the $43 million …