That might be a little optimistic. Although it depends what kind of campaign Vitter runs.
It will be VERY interesting to see who lines up behind Morrell's candidacy, especially what blacks. I would guess that Ray Nagin might endorse him -- he said he endorsed Republican Jindal in 2003 because both candidates were more conservative than his taste dictated. Endorsing Morrell would shore up his (Nagin's) standing in New Orleans, no?
How much longer should blacks be expected to wait before white Democrats will 'let' them run statewide? That's a question that will be asked, and that does not have a satisfactory answer.