However, Mitch Landrieu won't be too happy.
Breaux would certainly be a formidable contender in any statewide race. The plus side is that Breaux has not been on the ballot since 1998, and has not been challenged seriously since 1986, so if the Republicans decide to fight him head on if he runs, there could be a slight chance. It would depend on the Republican carrying North Louisiana and the Greater New Orleans suburbs by substantial margins, since Breaux will carry Cajun country pretty much no matter what, but he won't have a large amount of Democratic votes from New Orleans to help him.