With margins tight in both chambers, control of Congress in 2026 is expected to hinge on a small group of competitive Senate contests and House districts sensitive to national trends. As America plunges into a new year, here are the races that are most likely to define the midterm races.Senate Republicans are looking to maintain their razor-thin majority after flipping the upper chamber in 2024. There are 33 seats in-cycle in the forthcoming midterms, which often act as a check on an incumbent president's performance.The GOP is hoping to replicate the Election Day successes that helped preserv...

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