First of all, what a dumbass. Second, that guy is really looking out for safety of the roads doing that to moving motorists. Hopefully the wind blew it back in that criminal's face.
There is nothing in the constitution that would prevent a state from “appointing” its presidential electors by letting illegals vote. Nothing. Think about it, if the state doesn’t even have to let ANYONE vote, how and why would it not be allowed to let “illegals” vote if it cared to? Of course a state could allow illegals to vote in the “appointment” of the states members to the electoral college, because it could choose to appoint their electors by using a lottery.
If the state “elected” its “most numerous branch of the legislature” by a ballot that was open to members of ISIS living in Syria as well as to citizens in the state, then guess what? THAT is how they would then be allowed to vote for their congressmen and senators. There is nothing else to it. The provision is straightforward. It is left entirely to the states to decide who is eligible to elect their congressmen and senators.