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Sen. Bob Casey's campaign says he'll debate three times and Dave McCormick's says he'll be there.
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McCormick spokeswoman says he'll protect Social Security and Medicare and accuses Casey of making up the claims
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They're vying for the Senate seat Casey has held for three terms in one of the hottest races in the country
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Challenger Will Parker concedes he lacks enough signatures to run in the April 23 primary election.