Dave McCormick Is Projected to Defeat Sen. Bob Casey in Pennsylvania

Casey has not conceded the race, with his campaign saying it is waiting for additional votes to be counted.

Dave McCormick AP- 24310157105515

Matt Freed/AP

Republican businessman Dave McCormick is projected to become the next senator from Pennsylvania after narrowly defeating incumbent Sen. Bob Casey, toppling a three-term political scion.

The Associated Press called the race Thursday afternoon, marking the first time that Casey — the son of a former governor and a fixture of Pennsylvania politics for nearly three decades — has lost a statewide race. Fewer than 31,000 votes separated the candidates at the time the race was called.

Casey has yet to concede the race, with his campaign saying the race was too close to call.