Is Trump Sui Generis?

Yes, no, and maybe–it depends on the issue.

Yes, in that I can’t imagine a future candidate relying so heavily on the trappings of celebrity and ignoring the nuts and bolts of a conventional campaign:  a solid ground game; fundraising; a genuinely professional staff; etc.

No, as to the coarseness of the campaign, the extreme position on immigration, and the neo-isolationist foreign policy.  Remember, Mitt Romney ran on “self-deportation” in 2012;  Trump simply picked that up and lifted it to a new level. We are seeing campaign commercials for candidates for state offices who are talking about the wall.   This part of Trumpism isn’t going away anytime soon.

Maybe, on entitlements and protectionism.  These are Trump’s biggest heresies; they pit a large percentage of the GOP electorate against the leadership and the donor class.  I don’t know how that story ends yet.