Republican Dave McCormick defeated incumbent Democratic Sen. Bob Casey in Pennsylvania’s pivotal Senate race, the Associated Press projected Thursday evening, delivering the GOP yet another win after it regained control of the Senate. [time-brightcove not-tgx=”true”] McCormick’s projected victory marks a pivotal moment for the Republican Party, solidifying their gains in what was one of the nation’s most expensive Senate races and giving them a significant foothold in Pennsylvania, a state that has long been a key battleground in national elections. But with an estimated 91,000 votes still being counted, Casey’s campaign said it would not concede yet.