Mississippi Code Title 23. Elections § 23-15-1081

A presidential preference primary may be held on the second Tuesday in March of each year in which a President of the United States is to be elected. Each political party which has cast for its candidates for President and Vice President in the previous presidential election more than twenty percent (20%) of the total vote cast for President and Vice President in the state, may conduct a presidential preference primary. No elector shall vote in the primary of more than one (1) political party in the same presidential preference primary.