- never signed up for anything like this,
- never donated to or signed up for emails from the DNC, et al.,
- political texts like this come all the time, and
- I hesitate to reply “stop” because I don’t want them to know this is a live number (is my instinct here outdated/inapplicable?)
They already have the number. PACs pass around number lists all the time. Sending a stop message every now and then is the cost of your phone not blowing up during campaign season.