Pennsylvania will recount the race between incumbent Democratic Sen. Bob Casey and Republican David McCormick, who leads by 28,000 votes.

The U.S. Senate election in Pennsylvania between Democratic incumbent Sen. Bob Casey and Republican David McCormick is headed for a statewide recount, as counties continued Wednesday to sort through outstanding ballots and the campaigns jousted over which ones should count.

Republican David McCormick is projected to defeat Sen. Bob Casey (D-Pa.) in one of the nation’s preeminent battlegrounds, according to Decision Desk HQ, adding to the party’s margins after it took back control of the upper chamber earlier this week.