Mo. R. Gov. Bar Jud. 10.07
A special election to fill a vacancy for the unexpired term of any elective member of a commission, or to elect the first elective members of a newly created circuit judicial commission, may be held at any time upon being called by the Chief Justice of this Court or by this Court itself; provided that: (a) no special election to fill a vacancy for an unexpired term shall be called for a date that is 60 days or less before the end of such unexpired term; and (b) the call of such election shall be made not less than 60 days before the date fixed for the election. Special elections to fill a vacancy may be called for the same date as the date for a regular election and combined with a regular election. An election shall be deemed called when the call thereof (whether in the form of an order of this Court or a call signed by the Chief Justice) has been filed with the clerk of this Court. The clerk of this Court shall, promptly upon the filing of any call of a special election, send a certified copy thereof to the clerk of the court in whose office such election is to take place. Every call of a special election shall be a public record, and this Court or the Chief Justice may give such further publicity thereto as deemed fit.
Mo. R. Gov. Bar Jud. 10.07