Revise election laws to prohibit a political party from nominating a replacement candidate when the original candidate is found to be ineligible

SB 314 prevents Montana political parties from appointing replacement candidates if the original candidate is found ineligible after the primary filing deadline. It specifically prohibits replacements when disqualification stems from constitutional requirements (like residency rules under Article IV, Section 8 of the Montana Constitution), unless a party candidate was already nominated at the primary. This change applies only when the ballot certification deadline has passed and no party candidate was nominated at the primary election. The bill directly affects political parties' ability to fill vacancies in partisan races under these specific circumstances.