Mississippi Code Title 23. Elections § 23-15-1083

Beginning in 1988, as an alternative to the congressional primary election date set forth in Section 23-15-1031, when a political party elects to conduct a presidential preference primary, the first primary election for congressmen, and senators, if senators are to be elected, shall be held on the second Tuesday in March, and the second primary, when one is necessary, shall be held four (4) weeks thereafter, and the election shall be held in all districts of the state on the same day.