Yes, sorry, and probably a few others in that “etc”. :)
You’re right—if complete, it would be a very long list. Powell stands out, though, because ALL he does is criticize/attack Republicans and vote Dem. He claims he only remains GOP to annoy them, but it’s not that imo. Rather, he remains GOP because he craves media attention. He gets it as a backstabbing Republican, but he’d get nothing as a moderate Dem.