The Supreme Court decision today means almost nothing. The court ruled that Arizona could not require proof of citizenship when voters registered to vote using the federal form promulgated by the Election Assistance Commission.
Big deal. Arizona is still free to use the state form and require proof of citizenship. They can hand out state forms and keep the federal forms in a dusty box in the back.
Arizona can also ask the Election Assistance Commission to change the federal form for Arizona to require proof of citizenship.
The case has nothing to do with voter ID, so anyone who says otherwise is wrong. The real action comes in the next week when the Court decides Shelby v. Holder. Today’s Arizona decision was next to meaningless.