I feel sorry for Pubio. The kid works in politics, knows politics, but gets his poofter ass blown out of the water by political novice Trump in Pubio's home town.
But in a nut shell, the death of the Republicans came from Bush's correspondent's dinner speech.
When he joked about not finding WMDs, and the radio and TV news media gave him a standing ovation, that was no doubt the evidence of the blue print that Trump needed to put in effect to win the primaries.
In the world of business, when you fuck up as bad as Bush did, you resign. You resign to save face from getting your ass fired. Only in the world of poltics can you fuck up that bad and get re-elected, and have the media cover your back.
The world of politics simply lacks the accountabiity of the business world, or any other world for that matter.
The Don knows he could just appeal to the mass's disdain to Islam and immigrants and the marginalized out groups that exist.
A little bit of that, and a few catch phrases on making america great, having Mexicans pay for a wall, chants of USA and platitudes about saying making good deals - it is all it took to embarrass life long politicians of the Republican establishment. Again, the chickens have come home to roost.