The battle for the U.S. Senate is still tight, but prediction market traders think Democrats have one of their best chances yet of taking the upper chamber. Speculators on Kalshi now give Democrats a 54% chance to win the Senate, nearly matching a level reached in mid-April. On Polymarket , the odds are even higher, with a 59% chance that Democrats wrest control. Republicans are defending majorities in both the U.S. House of Representatives and Senate this November, but the upper chamber was always viewed as more difficult for Democrats to flip.
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