The only presidential candidate who's going to be on my ballot is Obama. I've voted Democratic all my life, and I believe that primary election party choice is freely available information in Illinois.
I can think of three reasonable possibilities why they are calling me:
(1) Whoever had my phone number before me was a Republican or a swing voter, or
(2) They aren't bothering to take the time or money to filter out Democrats and are just calling indiscriminately, or
(3) They guessed, or ran the probabilities based on available information, that I belong to a demographic they think might be receptive to conversion to the dark side (blue collar white guy with a high school education).
Depending on which of these is the case (it may be more than one, or something else I didn't consider), my response is...
(1) A Republican is more malicious than the typical bill collector, and almost as dumb. Yet even the bill collectors have figured out that whoever had my number before me, has long since moved on.
(2) I wonder how much they're spending on more phone bills than necessary compares to what they're saving on not bothering to check to see who is not likely to vote in the Republican primary.
(3) It's not gonna work, guys! It's going to be a cold day in hell before I'll support the party that wants to make me compete for my daily bread. Obama's my guy next week and in November!