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Lou Barletta wins Pennsylvania's Republican Senate primary

People cast their vote during the 2018 Pennsylvania Primary Election.
Photo: Mark Makela/Getty Images)

Rep. Lou Barletta, a Trump favorite, has clinched a victory in Pennsylvania's Republican Senate primaries, according to the New York Times.

Why it matters: The incumbent Democratic Senator Bob Casey's seat isn't particularly vulnerable, despite being one of 10 red-state Democratic senators. Pennsylvania is battling it out for several congressional spots, with a wave of women challenging sitting lawmakers.