Trump has attracted his coalition of supporters among those who are the most-weakly attached to the Republican Party as an institution.
The Trump phenomenon does seem to be sui generis... his celebrity persona, his extremely unusual and independent financial power, his felicity for not just recognizing but channeling the grievances of his supporters is unmatched.
But the Trump phenomenon also seems global and inevitable.
What is so crucial to Trump's success, even within the Republican Party, is his almost total ditching of conservatism as a governing philosophy.
What so frightens the conservative movement about Trump's success is that he reveals just how thin the support for their ideas really is. His campaign is a rebuke to their institutions.
I am not a Trump fan but it is clear that both parties are heavily invested in reducing or eliminating the middle class.