This is actually someone calling on behalf of Congressmen Alan Grayson (D-FL) - if you have made a contribution you might have given your phone number as well.
This is from Alan Garyson. They are doing political fundraising. Unfortunately, political fundraising is NOT under do not call legislation. So even if you ARE on the DNC list, they CAN still call you.
I did contribute so now I know how they got my number. But it's rude to have no CID info and leave no message. I'll leave a message for them saying so.