My guess is they will but I suspect JEB will be happy to bid for thier support by promising them something they want. Let's face it. All Bush wants to do is win. He'll jettison his "principles" if he thinks it'll help him get through the election with a big margin.
If he were truly popular he'd beat Reno 70 - 30. As we know the polls make it look like it'll be 55 - 45. Against Reno that'll be seen for the disappointment it is.