The 2026 U.S. Midterm elections will determine control of Congress and shape the political landscape for the remainder of the current presidential term. Prediction markets on Polymarket allow traders and analysts to explore outcomes across a wide range of midterm scenarios, from broad chamber control questions to granular race-specific predictions. Common markets include which party will control the House of Representatives, which party will hold the Senate, and outcomes of individual Senate and House races across key states. Markets also cover related topics like specific seat gains or losses, state-level dynamics, and demographic shifts in voting patterns. What factors move these markets? Polling data is a primary driver—shifts in public sentiment, approval ratings, and historical voting trends all influence price discovery. Economic indicators, legislative actions, and campaign developments can rapidly shift market expectations. Breaking news, debate performances, and major policy announcements create sudden repricing across related markets. Traders use these markets to express views on electoral outcomes based on their analysis of political fundamentals, demographic trends, and emerging data. The continuous price-discovery process means markets evolve as new information arrives, from early primary contests through Election Day itself. Whether you're interested in broad-brush outcomes like overall chamber control or granular state and district-level races, midterm markets on Polymarket offer deep liquidity and diverse perspectives from participants worldwide. These markets serve as real-time aggregators of expectations—a transparent window into how informed participants assess the contested outcomes of one of America's most significant electoral events.