Now on Kip Holden running for Lieutenant Governor: good luck with that because I seriously do NOT see it happening for obvious factors:
1. No African American has won executive statewide office in LA ever.
2. Racially-divisive politics
3. If Holden emerged as the only Democrat running for LG, white Conservative Democrats would bolt to the GOP candidates
Tell that to Thurbert Baker, an African American who won several landslide elections as Georgia's Attorney General, garnering a lot of support from conservative Democrats. I think there is prejudice in the south but it's more complicated than just skin color.
As for a possible Vitter-Dardenne runoff in 2015: there was a map posted earlier in this thread that said Vitter would win the areas Nungesser won in 2011. I find it hard to believe that he'd be able to win Orleans, though, since Dardenne is much more moderate than Vitter. If it was purely regional politics, then yes, Vitter might win Orleans.