Pennsylvania’s state Supreme Court on Monday weighed in on a flashpoint amid ongoing vote counting in the U.S. Senate election between Democratic Sen. Bob Casey and Republican David McCormick, ordering counties not to count mail-in ballots that lack a correct handwritten date on the return envelope. The order is a win for McCormick and a loss for Casey as the campaigns prepare for a statewide recount and press counties for favorable ballot-counting decisions. The Democratic-...