However, I think a Jindal victory next month still keeps the door open for the GOP. For one thing, it prevents Breaux from pulling an early retirement trick. This would keep John from running as an incumbent.
Also, with a Republican administration in Baton Rouge, it's just a bit more difficult for Democratic vote-hustlers to do their thing. Oh, they'll still be out in force, but at least the governor's office won't abet their efforts.
Finally, if Bush runs well next fall, Democratic turnout might be depressed.
Of course, if Jindal loses, then I share your pessimism.