美股 Senate is still a tossup, but Democrats now have slight edge, prediction market traders think 作者 btbitcoin_net 2026年9月17日 1 分钟阅读 Senate is still a tossup, but Democrats now have slight edge, prediction market traders think已关闭评论 Traders on both Kalshi and Polymarket see Democrats with one of their best chances to flip the U.S. Senate since the contracts on the election opened.