Really. Two RINOS mauling each other is a good thing to watch. Just back away and let it happen.
Jeb has to show some kind of improvement. What better way to do that than to take his nearest ideological twin. Placates the donors and moves him up. Ultimately, the higher up he can rise before the two primaries (Carson isn’t a factor now, frankly), the better.
Bush has to get to the number three spot at least for the GOP/RNC delegate cheat to work.