With no decisive winner called in the tight race for Pennsylvania’s U.S. Senate seat, David McCormick’s campaign manager said Wednesday he believes the Republican businessman will topple Bob Casey, the incumbent Democrat.

Incumbent U.S. Sen. Bob Casey is not ready to give up his seat just yet, even as the margin of votes show the three-term senator trailing behind newcomer GOP candidate David McCormick in his re-election bid.

Pennsylvania’s U.S. Senate race between U.S. Sen. Bob Casey and Republican David McCormick could help Republicans pad their newfound majority in the chamber. McCormick led vote counting early Wednesda