An one last point about Census:
They make a big point about privacy and Title 13 makes a big deal about it,
BUT
All it takes is for just the right crisis to come along and "they" will repeal the privacy clauses, retroactively, so quickly as to make your head spin. Regardless of what the government promises, they can just as easy with a single roll call vote reverse themselves.
So just use a little imagination. You're the MoveOn/Brady Bunch/Saros team and your goal is total gun confiscation. First you must locate all the guns. So on the guise of full understanding the problem you include a "gun related" question in the Census, err sorry, the ACS (which has the same power as the census). Privacy, privacy, privacy you exclaim. Just want to get a handle on the true scope of gun ownership. Maybe even the NRA is convinced to support this because they think it'll show how big and pervasive gun ownership is and it will scare congress into inaction. WRONG. The next crisis to come along congress will be urged to reverse the census privacy as it relates to firearms to help avoid the "crisis". (You can't waste a good crisis you know.) That private information you gave.....out the window. Feds now know what house doors to knock on. Lied on the survey form did you? Well, for those that didn't lie it'll just be confiscation. For those that lied, it'll be confiscation and jail. (you see it's always worse for those who lie to the government.)
Maybe won't happen that way. Maybe.