Why the US Supreme Court letting Pennsylvania's extended ballot deadline stand is one of its most important decisions this year

"If state courts are departing from state statutory law, there is an argument that they're doing something that is itself a violation of the federal constitution, which, after all, says that it's up to the state legislature to decide how electors are going to be selected," Paul Smith, the vice president for litigation at the Campaign Legal Center, explained to reporters in a Tuesday press briefing. "The argument is that a state court, for example, extending the deadline for ballots, is interfering with the legislature's exclusive authority to set the method for selecting electors," he added of the GOP's argument. 

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