Republicans enter the 2026 midterms holding a 53-47 Senate majority but defend 22 of the 35 seats up for election, many in states carried by President Trump in 2024. Recent polling averages and forecasts show Democrats competitive or leading in several Republican-held contests, including Texas, Iowa, Ohio, Alaska, Maine, and Kansas, contributing to models assigning Democrats a 60-66% chance of taking control. Key factors include national generic ballot trends, candidate-specific polling shifts in toss-up and lean races, and voter sentiment on economic conditions. With early voting underway in multiple states and three weeks until Election Day, additional surveys and campaign developments in battlegrounds could influence trader assessments of Republican majority odds ahead of October 31.