http://phoenix.about.com/od/citiestownsgovernment/a/voterid.htm
We have to show ID to vote in AZ. Straight off the Maricopa County web page -
14. What forms of identification are required in order to vote at the polls on Election Day?
Information on ID at the polls and the forms of identification required by Proposition 200, which was passed by Arizona voters in 2004, can be accessed by visiting our “ID? I Do! Do You?” button on the bottom right hand side of our main “Election’s Homepage”. On this page, clicking on the “New Voting Requirements” link will open up a list of acceptable forms of identification for the polls.
Good luck enforcing that with Eric Holder suing you and an injunction on the law issued before the election. Surprise.