Control of the Senate hinges on races in nine states, with Republicans holding 53 seats and needing to defend a map that forecasters now call a toss-up rather than a lean-Republican advantage.
Cook Political Report rates Alaska, Iowa, Maine, Michigan, Ohio and Texas as toss-ups, with Georgia, North Carolina and New Hampshire leaning Democratic, giving Democrats several paths back to a majority.
Candidates from Maine's Susan Collins to North Carolina's Roy Cooper are campaigning on immigration enforcement, the Iran war's economic fallout, and the cost of living, with a political scientist noting Trump's approval ratings make even tough states competitive.
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