Any official of the state of Idaho 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, in his judgment, the public interest will be served thereby: Provided, that the time, place and nature of such notice only be read or shown with no reference to any person by name then a candidate for political office, and that such broadcasts shall be made only by duly employed personnel of the station from which such broadcasts emanate, and that notices by political subdivisions may be made only by stations situated within the political subdivision of origin of the legal notice, but if no radio or television broadcasting station be situated in the political subdivision of origin, said notice may be broadcast over any radio or television station having general coverage therein.