With all the furor over Supreme Court partisanship, something I think is much more talked about than real, it’s easy to miss the consistency with which the court has ruled on voting regulations.
They are the state’s affairs.
Even Pennsylvania, which seemed to violate the plain meaning of federal law, was left to the state’s own rules. Other cases like California and North Carolina have been left to the states as well, with little regard to Democratic or Republican facitonalism. It’s not absolute, but it’s the clear trend.