All this does is say "you have to follow the law when you agreed by accepting the appointment" it says nothing about what the state can say is the law. ANY state can say "electoral votes from this state go to the nationwide popular vote". Essentially some states are trying this, but in a spineless way by saying "goes into effect when 270 electoral join". NOBODY is going to be that final state. Until then states look like they are taking a stand when they aren't.
