Mitt Romney is another example - I've said some charitable things lately about him, but he had to shapeshift *a lot* during that 2012 Election to appease the more extreme views of the GOP. It just goes with the territory.
I think the bolded is what makes today a lot different. "Evolving" or "flip flopping" has always been a feature of this game, but the degree to which ambitious pols (particularly in today's GOP) will entirely change their persona in the pursuit of power and the degree to which it is just sorta priced in (ie. "that's just politics") is really breathtaking to me.
Aside from JD Vance, the other one I'd put in this category is Elise Stefanik.... after the heel turn she made, in a logical world, she would never be taken seriously or believed ever again. But it's not a logical world, is it?