Respectfully, please look it up and adjust your position accordingly. They did not in any way enforce state law. They prevented the highest law of the land in that state from having a say, in order to block a recount that state authority demanded. It was an unequivocal abrogation of supposed state's rights. Basically, SCOTUS said it didn't trust Florida's chosen authorities to conduct a recount that would not violate EP (i.e., the very same clause conservatives had always previously sought to limit, because it mandated policing southern states in their endless attempts to block black voting), so they weren't permitted to try. This was the very exact opposite of "enforcing state law" -- it was saying Florida didn't even get to try.