Republican David McCormick is projected to defeat Sen. Bob Casey (R-Pa.) in one of the nation's preeminent battlegrounds, according to Decision Desk HQ, adding to the party's margins after it took back control of the upper chamber earlier this week.

The win by McCormick, a wealthy ex-hedge fund CEO, marked the culmination of a decade-long Republican effort to oust Casey. It also means the state's representation in the Senate will be split, as it had been for the 12 years before Sen. John Fetterman's (D-Pa.) victory in 2022.

Casey had led throughout much of the campaign, though that lead narrowed in the final weeks. According to an Emerson College poll, he led by a single percentage point two weeks out from election day.

The race was one of a handful of key states where Republicans were hoping to flip seats occupied by Democratic incumbents. With Pennsylvania, the GOP has managed to flip four Senate seats so far: the other seats include Montana, Ohio and West Virginia. Democrats managed to hold onto........

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