Mississippi Code Title 23. Elections § 23-15-317

If any person nominated for office in a primary election shall die, be removed after his or her nomination or withdraw or resign from his or her candidacy for a legitimate nonpolitical reason as defined in this section, and the vacancy in nomination shall occur between the primary election and the ensuing general election, then the municipal, county or state executive committee with which the original nominee qualified as a candidate in the primary election shall nominate a nominee for such office. Where such a party nominee is unopposed each political party registered with the State Board of Election Commissioners shall have the privilege of nominating a candidate for the office involved. Such nominee shall be duly certified by the respective executive committee chair. Within two (2) days after such nomination is made by the appropriate executive committee, such committee shall formally notify the Secretary of State of the name of the nominee. The Secretary of State shall thereupon officially notify the appropriate officials charged with conducting the election for the office wherein the vacancy occurred of the name of the nominee. All nominations made pursuant to the provisions of this section shall have the same force and effect and shall entitle the nominees to all rights and privileges that would accrue to them as if they had been nominated in the regular primary election.

“Legitimate nonpolitical reason” as used in this section shall be limited to the following:

Any candidate who withdraws based upon a “legitimate nonpolitical reason” which is not covered by the above definition shall have the strict burden of proof for his or her reason.

A candidate who wishes to withdraw for a legitimate nonpolitical reason shall submit his or her reason by sworn affidavit. Such affidavit shall be filed with the state party chair of the nominee's party and the State Board of Election Commissioners. No substitution of candidates shall be authorized, except for death or disqualification, unless the State Board of Election Commissioners approves the affidavit as constituting a “legitimate nonpolitical reason” for the candidate's resignation within five (5) days of the date the affidavit is submitted to the board.

Immediately upon approval or disapproval of such affidavit, the State Board of Election Commissioners shall notify the respective executive committee of same.