Mayor Ray Nagin is blunt.

With regard to the lawlessness in the streets of New Orleans, Mayor Nagin calls as he sees it.

BTW : the junkies likely don't stand a chance against trained National Guardsmen just back from Iraq.
Go get em.

And note the prohibition(s) against use of Federal Troops without explicit local/state request:

Posse Comitatus Act: Information From Answers.com:

"Posse Comitatus Act, 1878, U.S. federal law that makes it a crime to use the military as a domestic police force in the United States under most circumstances. The law was designed to end the use of federal troops to supervise elections in the post–Civil War South. The posse comitatus (from which the term posse derives) is the power or force of the county, and refers to citizens above the age of 15, who may be summoned by a sheriff to enforce the law. The act specifically prohibited the use of the U.S. army as a posse comitatus; the prohibition was later extended by legislation to the air force and by government directive to the marine corps and navy. The restriction does not apply to the coast guard during peacetime or the national guard when it is under state authority. There are legal exceptions to the law, particularly in aspects of drug law enforcement, in emergency situations, and in cases of rebellion."

CNN.com - Mayor to feds: 'Get off your asses' - Sep 2, 2005:

"I'm not sure if we can do that another night with the current resources.

And I am telling you right now: They're showing all these reports of people looting and doing all that weird stuff, and they are doing that, but people are desperate and they're trying to find food and water, the majority of them.

Now you got some knuckleheads out there, and they are taking advantage of this lawless -- this situation where, you know, we can't really control it, and they're doing some awful, awful things. But that's a small majority of the people. Most people are looking to try and survive.

And one of the things people -- nobody's talked about this. Drugs flowed in and out of New Orleans and the surrounding metropolitan area so freely it was scary to me, and that's why we were having the escalation in murders. People don't want to talk about this, but I'm going to talk about it.

You have drug addicts that are now walking around this city looking for a fix, and that's the reason why they were breaking in hospitals and drugstores. They're looking for something to take the edge off of their jones, if you will.

And right now, they don't have anything to take the edge off. And they've probably found guns. So what you're seeing is drug-starving crazy addicts, drug addicts, that are wrecking havoc. And we don't have the manpower to adequately deal with it. We can only target certain sections of the city and form a perimeter around them and hope to God that we're not overrun."