No person shall serve as a member, director, deputy director, or employee of the board of elections who is a candidate for any office to be filled at an election, except the office of delegate or alternate to a convention, member of the board of directors of a county agricultural society, presidential elector, or a member of a party committee. No person who is a candidate for an office or position to be voted for by the electors of a precinct, except for a candidate for county central committee who is not opposed by any other candidate in that election and precinct, shall serve as a precinct election officer in said precinct.