I couldn't possibly tell you why. I have a mom that *loves* Jeb (for reasons she's been unable/unwilling to communicate). But she doesn't "like" GWB anymore.
I don't know why. But she's in Florida. I'm not. Her vote will be more crucial than mine.
I have other relatives in neighboring states (and in FL too). But I realize it's not worth fighting over... he's not winning here (CA) but rather is going to lose elsewhere. Or not, maybe, but it's a very thin chance, IMO.