Interestingly, on my phone # that I've had since the early 80s, I get election spam for me, my brother (who, amusingly, generally votes for the party I don't) and occasionally my mother. I actually get less spam than my brother does, and neither party seems to know who we vote for, so I get spam addressed to my brother from the party I generally vote for.

Apparently, these data brokers suck at their job.