The AP has predicted that Pennsylvania will go to political newcomer Republican Dave McCormick, but with margins razor thin and votes left to count Democrat Bob Casey has not conceded the race. The AP has predicted that the state of Pennsylvania will flip one seat bringing the Republican total to 53 seats.

Republican Dave McCormick appeared to win a major upset victory in Pennsylvania, beating three-term incumbent Bob Casey, which would give the GOP a key win in the U.S. Senate, where it now holds 53 seats.

Pennsylvania saw one of the most expensive Senate races in the country this cycle — and McCormick had early backing from national Republican operatives during the state’s GOP primaries. But Casey has deep ties in Pennsylvania,

Republican Dave McCormick, an Army veteran and former hedge fund CEO, has unseated three-term Democratic incumbent Bob Casey Jr. in Pennsylvania’s nationally watched U.S. Senate race, according to The Associated Press.

Republican Dave McCormick wins the race for one of Pennsylvania’s two seats in the U.S. Senate, defeating incumbent Democrat Bob Casey.