Trump knew he’d been vetted enough that there would be no real skeletons, and he no doubt expected that the Democrats would be so desperate they’d invent some. They would have done that with anyone he put up — but, precisely because Kavanaugh was a milquetoasty DC Establishment type, seeing the Democrats go into full batshit assault mode on him galvanized the other milquetoasty DC Establishment types. You could see the lightbulbs go off in their heads: The Democrats don’t hate Trump because he’s Trump. They hate all Republicans and want to ruin them. Even me! And they always will.
The result is that the Kavanaugh affair has welded the Trump and NeverTrump forces (except for a few sad outliers who don’t matter) into a solid force. And it’s simultaneously galvanized GOP voters around the country, closing the “enthusiasm gap,” as the normals become more militant. Plus, it seems that minority voters aren’t as excited about empowering neurotic upper-class white feminists as you might — well, actually, I guess they’re just about exactly as excited about empowering neurotic upper-class white feminists as you might expect, but it seems Dems didn’t give that much thought. So Kavanaugh was, in fact, the perfect pick to trigger this reaction.
Trump is going to win big in 2020.