Idaho Primary Election Voter Registration Deadline (In the Election Office by) 04/26/2024 Idaho Primary Election Voter Registration Deadline (Postmarked by) 04/26/2024 Nebraska Primary Election Voter Registration Deadline (Postmarked by) 04/26/2024 Nebraska Primary Election Voter Registration Deadline (Presidential Primary - Online by) 04/26/2024 Nebraska Primary Election Voter Registration Deadline (At DMV and other State Agencies by) 04/26/2024