Yes, we have a winner: Arizona
Arizona is the only state that currently requires you to prove your citizenship before you can register to vote. This may behard for students who don't have an Arizona driver's license, and you may want to make sure you have a way to prove citizenship well before the registration deadline. In order to prove your citizenship when you register, you must provide either: (1) a valid Arizona driver's license number on your application, as long as the license was issued after 10/1/96; (2) a photocopy of a U.S. birth certificate; (3) a photocopy of a U.S. passport; (4) a valid certificate of naturalization number; or (5) a Bureau of Indian Affairs card number, Tribal Treaty card number or Tribal Enrollment number. If you register by mail or through a voter registration drive, you'll have to enclose one of these with your registration form. If you register in person at the County Recorder'soffice, you can also show original naturalization documents