Agreed. Assuming the ISP would let you buy all data on men in DC between 40 and 70 y/o, that have moved there within the past 6 months. You could then easily deanonymize it by sorting out which users have gone to which local newspaper website (ie Someone from dallas is likely to have gone to dallasnews.com or www.nbcdfw.com). Should be pretty easy to find a few congress members, or at least congressional staffers.