In Michigan, you can still vote without an ID if you sign an affidavit. http://www.michigan.gov/sos/0,4670,7-127-1633_8716-178123—,00.html
(I PROMISE, I’m not cheating!)
The affidavit is almost never used because most folks committing vote fraud aren’t interested in signing what amounts to an admission of guilt. That’s why they were so upset about the citizenship check box, it was effectively a signed confession.