Senator Joe Manchin has endorsed Republican Susan Collins in the 2026 Maine Senate race, repeating his past support for the incumbent. Collins faces Democratic nominee Troy Jackson, who holds a slight lead in polls but within the margin of error. Prediction markets had priced a Democratic win at 70.5%, a figure that may be revised downward following Manchin’s endorsement. Collins benefits from strong fundraising, including a 42 million dollar effort from the Senate Leadership Fund. Jackson entered the race after Graham Platner’s withdrawal, and market participants are closely monitoring developments that could shift the outcome.
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