The minute the evacuees sign up for any kind of welfare/government assistance, change the mailing address of their checks, or enroll their kids in school, they're legal residents of the new location so are no longer residents of the 9th Ward.
The minute the evacuees sign up for any kind of welfare/government assistance, change the mailing address of their checks, or enroll their kids in school, they're legal residents of the the Democrat super-radar mechanism will immediately hunt them down track them at their new location so are no longer residents of the 9th Ward and assure that their votes are counted in the next election.
When did the legal status of a "voter" start mattering to democrats? Laws are for OTHER people.