FYI, voter rolls and party registrations are public information, as is whether you voted in past elections (obviously not who you voted for, just that you signed for a ballot). There are companies that will send texts out for candidates, and identify whether people are registered R or D or independent, whether they voted recently, etc. How they scrape your phone number is a bit opaque. I always vote but never get the texts. My spouse gets the texts all the time.