Nagin, who has been a lifelong Republican, switched parties and with mostly Republican $$$, won as Mayor based on being a reformer. In the beginning (believe me--I know), he tried to reform the city. He even stood-up for (in a relative sense) white French Quarter bouncers who killed a black youth. He endorsed the Republican candidate for Governor which earned him a lot of Democratic enemies. These events turned a lot of blacks against him. Predictably, he has recently joined the black elitist establishment and has become part of the corrupt system.
Jesse Jackson, Maxine Waters, Sheila Jackson Lee, Charles Rangel, Sharpton, Conyers, and the rest of the Black Caucus have caused destruction within the black and white communities.
His belicose rhetoric then makes it either evident he's been brainwashed, OR as you say, been enlisted in the Marxist "black elitist establishment."