Section 34. Sections one to thirty-three, inclusive, shall apply to all public elections and to elections by the general court and by city councils and by either branch thereof, and, so far as applicable, to the nomination by primaries, caucuses, conventions and nomination papers of candidates to be voted for at such elections. The term ”political committee” as defined in section one shall not apply to the proprietors and publishers of publications issued at regular intervals, in respect to the ordinary conduct of their business, nor shall they, in respect thereto, be subject to sections two to six, inclusive, of this chapter.