Republican David McCormick has won Pennsylvania’s pivotal U.S. Senate seat, beating three-term Democratic Sen. Bob Casey.

Republican David McCormick cut Democratic Sen. Bob Casey’s leads in Philadelphia and its populous suburbs and built leads in the more GOP-leaning parts of Pennsylvania, foreclosing the incumbent’s pat

Republican Dave McCormick appeared to win a major upset victory in Pennsylvania, beating three-term incumbent Bob Casey, which would give the GOP a key win in the U.S. Senate, where it now holds 53 seats.