The Constitution, Article 1, Section 2
Seems the ACLU (All Crazies and Lunatics United) seems to have a basic comprehension problem, as they do in virtually every other issue they stick their noses in.
Electors there means “voters.” What is at issue is that the circulators of the petitions were not properly registered.
Conyers and ACLU will claim free speech rights are being violated. On the other hand, requiring petition circulators to be registered voters, at least theoretically, helps to insure the validity of the signatures.