I still have to believe, sadly, that the place is so polarized politically (beyond racially) that it would be irrelevent if a Black Republican got into the runoff. It rather reminds me of Gary, Indiana a decade ago when the Democrats nominated a White man (remarkable in that there are literally almost no White people left in Gary) and the Republicans thought they hit the jackpot when they nominated a Black man. Take a guess who won.
The LA GOP had a Black Republican from Baton Rouge named Kirt Bennett running for Lieutenant-Governor and he barely registered a blip on the radar screen in the last statewide election. I always wondered when Bobby Jindal ran for Governor and increased his numbers in N.O., was the increased support from Black voters, or was it from more liberal-minded Whites who preferred the more educated and intelligent Jindal to the country-bumpkin Blanco ?
Jindal was endorsed by Mayor Nagin, and it is thought that he did pretty well for a Republican among New Orleans blacks.