And they are on it - Mississippi

Let us hope that Louisiana gets with the program soonest.  From FEMA:

Now the Federal Government can transport people, aid, troops, supplies, etc... into Mississippi. Each State in this Republic is a sovereign entity and the Federal Government can not come in without permission. This is in several parts of the Constitution.  The Tenth Amendment to the Constitution makes it even clearer.
Governor Blanco really blew it with Katrina. She waited for three days before asking.