It does not happen very often, but sometimes a judge will rule on a case and consider States’ Rights’ and the 10th Amendment.
This is of course opposed to all those liberal activist judges who seek to interfere in the right of a state to hold elections as they see fit.
The ruling isn’t based on States’ Rights, but on the equitable doctrine of laches — essentially, that the plaintiffs should have filed suit as soon as they entered the race last summer.
He specifically says that they would have been entitled to the relief sought had they filed sooner.