Because the GOPe has seen to that. They want Hillary.
I have never before seen top names of the Republican Party announcing that they will be voting for a Democrat. This is an outrage. It shows you the desperation of the establishment.
No, the GOPe wanted a professional politician. They would have settled for Cruz, which is saying a lot. Trump can get them if they think he will win. Even the GOPe wants to win again. Trump has come a very long way for a political amateur. It is not significant unless he defeats Clinton.