Don't you know? ... "Political Surveys" are exempt from the DNC list!
ANYONE can call your number by just saying they want you to answer a few of their survey questions first. THEN they ask for your credit card numbers and any other information they can con you into giving them.
Sounds like a scam to me. It identified itself as a political poll, claiming that I'd get a cruise to the Caribbean if I completed it. I continued, more out of curiosity than anything else. I tried answering the first question, and it kept telling me I was making an invalid entry when I tried answering it with my dial pad. I hung up.