Republican Dave McCormick defeated incumbent Democratic Sen. Bob Casey in Pennsylvania’s Senate race, The Associated Press projected, marking the 53rd Senate seat Republicans have captured in winning back the majority.

Republican Dave McCormick was projected to defeat Sen. Bob Casey (D-Pa.), denying him a fourth term in an upset that signals a dramatic shift in fortunes for Democrats in the country’s quintessential battleground state.

Bob Casey’s (D-PA) reelection campaign is bracing for an automatic recount in Pennsylvania’s battleground Senate race that remained among the handful too close to call. Republican Dave McCormick led Casey 48.