“North Dakota is a rural state and its communities maintain close ties and networks. North Dakota’s system of voting, and lack of voter registration, is rooted in its rural character by providing small precincts. Establishing relatively small precincts is intended to ensure that election boards know the voters who come to the polls to vote on Election Day and can easily detect those who should not be voting in the precinct. This network of small precincts reduces the need for voter registration.”