North Dakota voters are deciding Tuesday whether to rewrite the rules for future constitutional amendments, even as they fill out ballots in primary races that will help shape the state’s 2026 political map. The measure would bar any future proposed amendment from covering more than one subject, a change with lasting consequences for how statewide ballot questions can be drafted.

The vote lands on an Election Day that also includes a Fargo mayoral race, where term-limited Tim Mahoney is being succeeded after a citywide contest with five candidates. Fargo is choosing its next mayor for the first time since the state banned approval voting, the system the city adopted in 2018 and used to pick a winner without limiting how many candidates a voter could back.

That makes Tuesday more than a routine primary. Voters are also choosing nominees for several top statewide offices, though secretary of state, attorney general and agriculture commissioner are unopposed. In the marquee congressional race, Republican U.S. Rep. Julie Fedorchak is seeking a second term against former foreign service officer Alex Balazs, who placed fourth in the 2024 contest with 4% of the vote, while Democrat Trygve Hammer is running again and will face the Republican nominee.

The ballot measure is the sharper test of the day. If approved, it would force future constitutional amendments in North Dakota to stay within a single subject, narrowing what can be bundled together in a statewide proposal. That rule would not change this year’s races, but it would change the structure of future fights over the state constitution.

Fargo’s mayoral race carries its own complication. The city commission voted in 2025 to make the job full time, and the new election format follows the end of a voting system that let residents choose as many candidates as they wanted. With five contenders on the ballot, the city is moving into uncharted ground after years under a rule designed to reward the broadest support, not just the largest pile of votes.

More is coming after polls close at 7 p.m. local time, which is 8 p.m. ET in most of the state and 9 p.m. ET in western counties on Mountain time. The will declare winners in the contested primaries for U.S. House, state Senate, state House, Public Service Commission and state school superintendent, along with the Fargo mayor’s race and the statewide ballot measure. How many voters turn out for any of it will not be clear until the counting is done.

North Dakota’s broader political map is unlikely to shift overnight. More than half of the state’s 47 Senate seats and 94 House seats are not on the ballot until 2026, and many of the top statewide offices — including governor, lieutenant governor, treasurer and both U.S. Senate seats — are not due until 2028 or later. Republicans also hold overwhelming majorities in both chambers, and the state has voted Republican in the last 15 presidential elections, including 67% for Donald Trump in 2024.