I know I don't answer unknown calls. I also get all my calls from CA, because my # is still CA, while I live in MD, so it's easy for me to assume they are garbage calls. All the text spam that I get it is local CA elections and proposition begging. I get very few MD calls, but I still only answer maybe half of them, when I am expected a call from a bank or clinic or, whatever. Still, all of my MD residency forms that I have signed through the years--DMV, mortgage, employment, whatever, have the same phone number....so I'd expect that I still get MD calls for campaigns, no?
Or do campaigns not use state registration data to make their calls? Do they just go through lists of registered phone numbers? With cell phones, area codes no longer mean anything. And democrats, I'd think, are more likely to move around the country. Where I've worked over the years, my lab groups are usually constructed of people from all over the country, with various area code phone numbers and of course many of them are just international.
I honestly can't recall the last time that I've been polled....but now that I think about it, living in Chicago, Berkeley, DC area over the last 15 years might explain it. No one is interested in those voting trends.