missed a few calls, when i called back it was for voter registration

Got this call too. Left a message to the effect that our "new" address was incorrect for mailing a ballot and we should call a number and operators were there to help us get registered correctly. The thing is, we've lived in the same house for 10 years! I'm wondering if this was just a blanket call to make sure everyone gets registered, or is it some kind of scam?