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.

On November 5, Pennsylvanians will have a chance to vote for who will represent them in the U.S. Senate for the next six years.

One of Pennsylvania's two U.S. Senate seats is before voters Tuesday, with Sen. Bob Casey vying for a fourth term against challenger and businessman Dave McCormick. It is expected to be a close race and could ultimately play a role in the balance of power in the Senate.