Two thumbs down to you pal...
He did it too late.
People have only had time because of logjam traffic to move about a hundred miles or so. As metereologists have noted, this still leaves them in the path of the storm. These people have only improved their luck moderately.
Had they left Thursday, they could have gotten completely out of Katrinas path.
The mayor was not ready to declare mandatory evacs even by this morning, he only did so at Bush's insistence.