Why is there legally allowed spam? Because it's for democracy? I don't care, I don't want to receive calls and texts related to it. Spamming my phone is more likely to make me go out and vote for the opposition out of spite than anything.
You can vote for the opposition if that makes you feel better, but know right now that the opposition, whatever it may be, for any major political office is doing exactly the same thing. Every significant political party has list-making and trading as one of its highest priority goals.
Generally, there are two subcategories of TCPA claims: DNC (227(c)) and ATDS/prerecorded voice (227(b)). The latter claims are still available against politicians, last I checked. The latter claims regulate the technology that allows blast calls and messaging with pre-recorded messages.
not legal advice