Wisconsin Constitution Art. XIII § 10. Vacancies in office

Section 10. (1) The legislature may declare the cases in which any office shall be deemed vacant, and also the manner of filling the vacancy, where no provision is made for that purpose in this constitution.

(2) Whenever there is a vacancy in the office of lieutenant governor, the governor shall nominate a successor to serve for the balance of the unexpired term, who shall take office after confirmation by the senate and by the assembly.