Republican David McCormick defeated three-term Democratic Sen. Bob Casey in Pennsylvania, the Associated Press projected, underscoring the battleground state’s red shift this year while expanding the GOP’s Senate majority in the next Congress.

Republican David McCormick cut Democratic Sen. Bob Casey’s leads in Philadelphia and its suburbs and built leads in GOP-leaning parts of the state, foreclosing the incumbent’s path to

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