I stupidly signed my name in at a single campaign event almost a decade ago. Of course, that information made it's way to a large local political organization, and they've refused to remove me from their contact list, no matter how many times I asked.

What has sort of worked is replying, every time they contact me, that their nonconsensual text messages have swayed me to vote against their candidate or issue, and I that will continue to vote, out of spite, against any candidate that sends me unsolicited texts messages.

It's not perfect, but I have gotten significantly less election related text spam since I started this approach.

Just to be clear, I spent years asking them politely to take me off their lists, but nothing reduced the volume of election spam until I switch my approach to this.