McCormick has declared victory, though Casey, who has served in the U.S. Senate since 2007, has refused to concede. The Pennsylvania Supreme Court ruled Monday, as it did just weeks before the election, that mail-in ballots missing the date on the outer ...

But the extent of the party’s power in the U.S. Senate remains unclear owing to the outstanding race in Pennsylvania. Democratic senator Bob Casey has yet to concede to his Republican challenger Dave McCormick,