According to CoinMeta, in the 2026 U.S. Senate elections, market data for Polymarket indicates that Democrats had a 66% chance of victory on September 23, 2026, while Republicans had a 35% chance. This change marks a complete reversal from the early stages of the campaign when Republicans were considered favorites. The prediction market supports political forecasts with real funds, which is different from opinion polls. The current odds of 65.5% reflect the implied probabilities of traders, not the results of polls, and these odds may change again before voting. According to market data, Republicans currently hold a 53-47 majority in the Senate, with 22 seats up for election in 2026. Market data also shows that Democratic candidates are leading or in competition in several key states controlled by Republicans, including Alaska, Iowa, Maine, Ohio, and Texas.