Got six calls from this number yesterday and 2 calls the day before.  Caller is listed as unknown and no message is left.

I just got a phone call from them and they had me participate in a survey for "Planned Parenthood Votes". Pissed me off because they asked me if I was voting for Romney or Obama when they aren't the only candidates running.

Most of the message was cut off, but at least they left one!  A call reminding me how to be able vote in the upcoming election.  These messages are permitted.  It wasn't a recording, either; it was a real, live person!  I just never answer a call from a number that isn't in my address book.

I didn't answer and they left no message, so I called it back and it was someone taking a survey on current events.
BLOCKED THE NUMBER!  

called today.  left no message