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With a key race too close to call, here are 4 takeaways from Tuesday's primaries

Pennsylvania's Republican Senate primary is too close to call between David McCormick, left, and Mehmet Oz. (Hannah Beier/Bloomberg via Getty Images; Stephanie Keith/Getty Images)
Pennsylvania's Republican Senate primary is too close to call between David McCormick, left, and Mehmet Oz. (Hannah Beier/Bloomberg via Getty Images; Stephanie Keith/Getty Images)

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