Its too early to give undying support to any candidate. All I can say for sure is no to Lindsay and Jeb! Oh, and Mitt should stay home. I won’t trash Trump, though; he opens the discussion to the politically incorrect, and he doesn’t apologize for saying what he believes.
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.