That is interesting! That makes me wonder if the machine uses lower tier candidates as almost data harvesters for the higher tier candidate's database. I wonder what kind of data sharing you have to agree on to be party affiliated so to speak.
I get contacted by Republicans, Democrats, and Libertarians about Federal and more than one states/ local races. Likely local candidates provide phone lists to state parties and in turn the national parties. You have to provide your address and phone number when you register to vote. Even the DMV sells your information.
I sent Bernie Sanders $10 in 2016 and I’m still paying for it.