Some of Bush/McCain/Romney voters became Democratic now.
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Yes they have.
Also, that group doesn’t have any political ideas outside the political status quo. A win for them in 2026 House elections would be pyrrhic victory that won’t last long.
They were in favor of faux conservatism. They were pro-business generally but at the same time they would like to rig the system to enrich themselves.
They loved tax loopholes. They saw that they weren't going to get that with Trump. So it made sense to switch their allegiance to Obama/Biden.