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 has won Pennsylvania’s pivotal U.S. Senate seat, defeating three-term Democratic Sen. Bob Casey.

The U.S. Senate race is going to an automatic recount, requiring already exhausted election officials to reprocess seven million ballots in under two weeks.