sorted by:
You have a profile with a data analytic company, they have your phone number. You said or posted something somewhere that added you to their call list. Someone wrote an algorithm that decided reaching out to you might sway your vote towards Bernie.
It's same way you see ads pop up for stuff you talked about when your phone is around. Facebook isn't directly recording or listening to your conversation but if you're logged into their app with the device it is listening for key words and will sell your contact info to companies they think might want to send you ads.
Lose a drag race, that's about it.