Any official in this state who shall direct or authorize the expenditure of any public funds under his care, except as specifically authorized by law, to be used either in support of, or in opposition to, any measure which is being referred to a vote of the people by means of the initiative or referendum, or which citizens of this state are attempting to have referred to a vote of the people by the initiative or referendum, shall be deemed guilty of a misdemeanor, and the office held by such party shall be adjudged vacant and shall be filled in the manner prescribed by law.