Didn't SCOTUS find that Indiana's voter ID law passed Constitutional muster? If so, every state with a R Governor and R legislature needs to copy it, verbatim, making substitutions for place names as needed, and pass it ASAP. When the howls start, just reply that this language has already been found to be constitutional and will be utilized.
Then states like TX who have to have DOiJ approval for voting changes due to the Voting Rights Act need to sue the gov't under equal protection grounds, or 10th amendment grounds, or whatever, stating they are being treated as not as sovereign as other states (i.e. Illinois) because they can't control voting procedures in their territory without fed approval.