Well, you can be 100% sure that ACORN people will be doing that. Sure, ACORN name has been removed from official sites, but the actual people are still doing it. They have always been working under several names, sharing office space and mail box with tons of different organizations.
And when they were 'involved', they were 'only' one of the "partner agency's" that screen and recommend people to be hired by the Census Bureau. Now *maybe* this person who called didn't get the memo they are no longer wanted by the Census Bureau and all ties have been cut.
btw, I have this Bridge For Sale, its in Brooklyn ;-)