They called me twice on 8/14, once on 8/15, and once today. They did not leave a message.
The calls come from a company called 'Strategic Fundraising' and you are put on their list when you sign up to some kind of Political (or other) cause. You are given opportunity to add your number to their "Do Not Call" list by calling them and pressing zero, then entering your number. I just did this and a prompt says it may take 48 hours to register with their systems. Will advise if this solves the problem.
THE ANSWER IS Feb 14th, 2009
this number has called me five times in the last three days with nobody on the other side of the line.