When Did FEMA Become the LA Secretary of State?

Since when is FEMA responsible for having the correct addresses of persons displaced by Hurricane Katrina, to the extent that Louisiana's Attorney General would threaten to sue FEMA for the info?

The Attorney General said "that location information is crucial to finding voters and rescheduling New Orleans' postponed February elections." Is it possible it's the voters' responsibility to file a change of address? And is it also possible some of the displaced voters no longer meet residency requirements to vote in the election anyway?

The Attorney General also said, "I'm a big, grown-up boy. I should have filed suit a long time ago." I'd suggest both his tone and the second sentence in that statement indicate the first sentence is incorrect.