Do other states cancel a registration if the voter fails to vote?
Yes. The National Voter Registration Act, the federal law that prohibits canceling a registration simply on the basis that the voter failed to vote, does not apply to six states. These states either had no voter registration system (North Dakota), or had election-day registration (Idaho, Minnesota, New Hampshire, Wisconsin, and Wyoming) by August 1994 so they are exempt from this federal law. Some of these states cancel a registration if the voter fails to vote.