Section 4. Unless the incumbent otherwise requests, in writing, the incumbent's name shall be placed as a candidate on the official ballot without nomination. Other candidates for the office may be nominated to be voted for at said election. The candidate who receives the highest number of votes shall be declared elected for the remainder of the term. Unless the incumbent receives the highest number of votes, the incumbent shall be deemed to be removed from office, upon qualification of the successor. In the event that the successor shall not qualify within five days after the result of said election shall have been declared, the said office shall be vacant, and may be filled as provided by law.