As far as I am concerned there is never an appropriate time to give undying support to a politician.
I most definitely agree with you about Graham, Bush and Romney - and I’d add Rick Perry to that list as well (although I have not heard much about him lately.
My jury is still out on most of the others, including Donald Trump, despite the lies a certain Trumpbot is telling about me on this thread.
Even a phony punctuation mark cannot create enthusiasm for Bush.