I think you're right that this is will harm Republican candidates in the election this fall. But that doesn't mean the judges on their Supreme Court were wrong. As the court case file you linked states right at the beginning, it's a case of statutory interpretation and application, not questions of fact. The law is on the books. How many years did Arizona have a Democrat-controlled legislature that could've repealed this law? (I don't know the answer to that, but you know what I'm saying.) Neglecting what easily could've been done when Democrats had the power to do so is what led to this. But noone on the news will say that out loud.