Republican David McCormick has won Pennsylvania’s pivotal U.S. Senate seat, beating three-term Democratic Sen. Bob Casey.

The U.S. Senate election in Pennsylvania between Democratic incumbent Sen. Bob Casey and Republican David McCormick is headed ...

The former hedge-fund manager’s victory over Democratic incumbent Bob Casey brings the GOP total to 53 seats.

McCormick declared victory in the Pennsylvania race but is seeking to challenge provisional ballots in the Democratic stronghold.

Republican David McCormick GS ’94 ’96 defeated three-term incumbent Democrat Bob Casey on Nov. 7 according to an AP election ...

Republican David McCormick cut into Democratic Sen. Bob Casey’s support in Philadelphia and its populous suburbs and built ...

WASHINGTON (AP) — Republican David McCormick cut into Democratic Sen. Bob Casey's support in Philadelphia and its populous suburbs and built leads in the more GOP-leaning parts of the state ...

(AP Photo/Matt Rourke) Republican Pennsylvania Senate candidate David McCormick, left, arrives to speak with his wife, Dina Powell, during an election night watch party, Wednesday, Nov. 6 ...

(AP Photo/Matt Rourke) Republican Pennsylvania Senate candidate David McCormick, left, arrives to speak with his wife, Dina Powell, during an election night watch party, Wednesday, Nov. 6 ...

WASHINGTON — Pennsylvania's Senate contest between Democratic incumbent Bob Casey and Republican challenger David McCormick is still too close to call. On Thursday morning, McCormick has a ...

HARRISBURG, Pa. (WPVI) -- Republican Dave McCormick has declared victory over Democratic Senator Bob Casey in Pennsylvania's pivotal U.S. Senate seat. The Associated Press called the race for ...