In the US, our campaign finance is heavily corrupt. There is no public finance system so candidates beg for money anywhere they can. Our 2020 elections spent nearly 15 billion dollars between our president and our congress. Some of that money comes from candidates directly asking for money. Other times, supposedly independent organizations (superpac) working to further the cause of a candidate, but not directly working with them, will also try to fundraise and campaign on their behalf without direct coordination. There is no limit to the amount of money such an org can get or spend, because the conservative Supremes ruled it an expression of free speech. Other conservatives worked to mask the sources of funding for such organizations.

Political activity was specifically excluded from our already sad and almost never enforced spam laws. Further, individual campaign donations are considered a matter of public record. So individual donors get recorded in these databases, and then private companies like NGP will harvest those databases, cross reference / deduplicate people with other databases, figure out their email and text contacts and then sell that information to candidates and parties who will in turn use it to spam you nonstop across email and SMS for every subsequent or similar election.

Good times.