Republican U.S. Senate candidate Dave McCormick on Thursday appeared to declare victory in his race against Democratic incumbent Bob Casey Jr. despite The Associated Press not having called the race and the possibility that the narrow margin triggers Pennsylvania’s automatic recount process.

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.