La. Const. art. X, § 27

(A) Gubernatorial Appointment; Election. If no other provision therefor is made by this constitution, by statute, by local government charter, by home rule charter or plan of government, or by ordinance, the governor may fill a vacancy occurring in any elective office. When a vacancy occurs in the office and the unexpired portion of the term exceeds one year, the vacancy shall be filled at an election, as provided by law, and the appointment shall be effective only until a successor takes office. (B) Qualifications. Nothing in this Section shall change the qualifications for any office, and every appointee must be otherwise eligible to hold the office to which appointed.