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Ms. Lee, who could become the first Black woman to represent Pennsylvania in Congress, won an expensive and fiercely fought primary battle after days of vote-counting.
How will progressive Democrats fare against moderate rivals? What signals will North Carolina Republicans send? And in Pennsylvania, will Kathy Barnette concede a loss?
The endorsement by Jake Corman, who dropped out of the race, represents the starkest step yet for Republicans who are trying to halt the primary’s front-runner, Doug Mastriano.