CNN’s Election Center uses pre-election race ratings by Inside Elections with Nathan L. Gonzales. This year, 34 of the 100 seats are on the ballot. Democrats are defending a razor-thin majority, a task made all the more difficult by a playing field that leans in Republicans’ direction. Democrats are defending three seats in states that twice backed Donald Trump, and four in states the former president won once. See CNN’s ranking of the top 10 Senate seats most likely to flip in November.

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