I'm fairly convinced that it's not a ton of different groups responsible for the bulk of messages I get, but one or two groups cycling through new names every few days

If I don't reply "stop" to anything, it seems like one day "Retired Democrats PAC" will suddenly stop sending me messages and "Save Democracy PAC" will suddenly begin, and that pattern is what makes me think a single group is behind a lot of it.

If I do reply "stop" to one, of course they will stop from that PAC, but a few days later another one will always pop up and pick right back up.

Every few days I send out a mass "stop" to all of the numbers I've gotten messaged by, and it usually gives me 3-4 days of peace.