(1) National convention delegates elected under this act shall be elected on a basis that insures that the proportion of the total national convention delegation that is uncommitted or is committed to each presidential candidate equals, as near as is practicable, the proportion of the popular vote that was cast as uncommitted or for each respective presidential candidate of the particular political party's total popular vote at the presidential primary election. The determination of these proportions shall only include the votes cast as uncommitted, or for a particular presidential candidate, if the total vote cast as uncommitted, or for that particular presidential candidate, equals at least the percentage determined by state political party rule of the total vote cast for all presidential candidates or as uncommitted for that political party at that presidential primary election.

    (2) Before an individual may be elected as a delegate to the national convention of a political party, that individual shall file an affidavit as required under section 562b. If the individual names a presidential candidate in the affidavit under section 562b(1)(a), that individual shall also be certified by the presidential candidate or the presidential candidate's designee as a delegate committed to that presidential candidate. A national convention delegate shall be bound to vote for the presidential candidate for whom he or she designated commitment, if any, under section 562b and as certified by the presidential candidate or the presidential candidate's designee under this section before the delegate is elected as a national delegate until the end of the first ballot at the national convention. However, a national convention delegate is released from that commitment by the withdrawal of that presidential candidate from contention for that party's nomination or by written release of that presidential candidate to the chairperson of the national convention, whichever is earliest.

    (3) If a vacancy occurs in the elected delegation, it shall be filled by an alternate selected by the caucus for the candidate to whom the original delegate was committed, and the alternate shall be required to meet the same qualifications of the delegate being replaced.

    (4) A person who is a delegate at large to a state convention of his or her political party only by virtue of being a member of the state legislature as provided in section 595a shall not participate in the selecting of delegates to his or her political party's national convention. This subsection does not prohibit that person from participating in other convention business. Neither this provision nor any other provision of law shall be understood to restrict the opportunity of any registered elector in this state, including all public officials, to be elected as a delegate to any county, district, state, or national convention of the elector's political party.