Mr. Biden’s hopes for working with a more expansive majority will hinge on whether his party can capture a cluster of Republican-held seats across the Big Ten region: in Pennsylvania, Ohio, Wisconsin and Iowa. Former President Barack Obama won all of those states both times he ran, but they have become more forbidding for Democrats, or at least more competitive, as working-class white voters have become more reliable Republicans since the rise of former President Donald J. Trump.
“If we’re going to have a real majority for Biden, we’ve got to figure out how we can get up to 52 to 53 seats, and that means Pennsylvania, Ohio and Wisconsin,” said Doug Thornell, a Democratic strategist. (Iowa, which has been as difficult for Democrats as Ohio in recent years, may be competitive as a Senate battleground, but only if its longtime Senator Charles E. Grassley, 87, retires.)
Beyond the question of the Senate majority, how these states behave in 2022 could carry profound implications. If they revert to a more Democratic orientation in the aftermath of the Trump era, it would suggest that the rightward shift of working-class white voters in recent years was driven by affection for one outsize figure. If Republicans win across the region, though, it may portend a more enduring realignment and raise sobering questions for Democrats about the Senate and presidential maps.
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