Republican Dave McCormick, an Army veteran and former hedge fund CEO, has unseated three-term Democratic Sen. Bob Casey Jr. in Pennsylvania’s nationally watched U.S. Senate race, according to the Associated Press.

Republican Dave McCormick won the U.S. Senate election in Pennsylvania, Decision Desk HQ projected on Thursday, beating Democratic incumbent Bob Casey in an important win for Republicans hoping to capture a majority in the chamber.

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.