Miss. Code § 23-15-305
The candidate who received the majority number of votes cast for the office which he seeks shall thereby become the nominee of his party for such office and no person shall be declared to be the nominee of his party unless and until he has received a majority of the votes cast for such office, except as hereinafter provided. If no candidate received such majority of the votes cast in the first primary, then the two (2) candidates who receive the highest number of votes cast for such office shall have their names submitted as such candidates to the second primary and the candidate who leads in such second primary shall be nominated for the office.
If the candidate who received the second highest number of votes cast for such office for any reason declines to enter the second primary, then in that event the candidate who received the third highest shall have his name submitted to the second primary, together with the candidate who received the highest number of votes cast for such office.
If the candidate who received the third highest number of votes cast for such office for any reason declines to enter the second primary, then in that event the candidate who received the fourth highest shall have his name submitted to the second primary, together with the candidate who received the highest number of votes cast for such office.
If no candidate will enter the second primary with the candidate who received the highest number of votes cast, then the candidate who received the highest number of votes cast in the first primary shall be declared the nominee of his party for such office.
Miss. Code § 23-15-305