Any official of the state or any of its political subdivisions who is required by law to publish any notice required by law may supplement publication thereof by radio or television broadcast, or both, when such official determines the public interest will be served thereby, except that the broadcast of legal advertisements concerning question submitted elections, only the time, place and an unbiased summary of the resolution or question of such notice only shall be read or shown, and no reference shall be made to such official by name, and no such person shall be seen or heard in the broadcast.