It is a political call for "Bachmann". I have three different phone numbers for "Bachmann" on my caller ID and this is one of them. I blocked one of the numbers but the calls keep coming.
The "Caller ID" says "Bachman4Congress" but I seriously doubt that's who is really calling. That ID shows up with other numbers from other area codes. And I've even tried answering the call so I can tell them to take me off their list but no one is on the other end of the call.