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

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.

Pennsylvania Sen. Bob Casey, a stalwart moderate who rose to power on the heels of his late father’s political legacy, has lost his reelection bid, the Associated Press has called. The three-term incumbent was challenged by former hedge fund executive Dave McCormick in what became a surprisingly competitive race.