Democrats secured Senate control in the 2026 midterms through net gains of seven to eight seats, with several races decided by margins under 5 points amid a broad shift toward Democratic candidates compared to 2024 presidential results. The closest contests included Mississippi (Dem flip by roughly 0.5 points), Louisiana (GOP hold by about 1.8 points), Florida special (GOP hold by 2.9 points), Iowa (Dem flip by 4.2 points), South Carolina (Dem flip by 4.5 points), and Ohio special (Dem flip by 4.9 points). Vote counting in Alaska and Mississippi extended days past Election Day, while most other races reached 95-99% of expected ballots by November 11. Certification timelines, potential recounts in narrow margins, and final official tallies will determine exact resolution for prediction markets tracking sub-5% outcomes.