My prediction: a deal with Blanco will be cut. Oh, sure, Cleo & Co. will exact a blood price, but they can only do so much if people don't really care to go out and vote, and blacks don't see Jindal as a threat or Blanco as a boon.
Ieyoub and Leach had these folks on board in the primary, and they couldn't even break 16%. Hell, even giving Blanco EVERY black vote Ieyoub and Leach got -- a dubious assumption -- that only gets her to, what, 40%?
If you look at some of the most important down-ballot runoffs, few will maximize black turnout. Landrieu's win in the L.G. race, while disgusting, will likely help Jindal, as will Cleo Fields' and Don Cravins' outright wins in Saturday's primary (both black state sens. and both in heavily black districts). I do think the race will be close, but Blanco would have to initiate some kind of negative racial campaign against Jindal in order to energize the black vote.