Sorry, but Nagin had too many opportunities to make things right.
Beginning with the buses, then putting off the mandatory evac. till the last minute because he was afraid of lawsuits, tells me he doesn't have the right stuff.
Finally, he was whining just like the others about lack of Fed help. He made a lot of noise but never did anything.
Nagin doesn't have the "right stuff" to be mayor of a Crack House.