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Of those 3. I would go with Warren, then Bernie, then Biden.  And I would be grateful for any of them to be POTUS instead of T rump.

As far as Buttigieg, beating T rump, if he can win the Dem Nomination, he will be as good as anyone in defeating T rump.  Also, recall that in ’07, at the point in the primary process that we are in now, in ’19, Obama, the eventual winner of that primary, was not noticeably very popular.

I think Buttigieg is the best bet.  But there is also, still in the race, Corey Booker (who I like, but don’t think he is the best bet, because I realize the underlying power of racial bias that still exists in the USA).  Also, there is Amy Klobachar.  She is a bit too moderate for my tastes, but is still imminently acceptable, compared to T rump.  She has going for her that she is a woman.  But then she has going against her that she is a woman. (Being a woman candidate is a plus in my book as the Dem Nominee, but it has the downside that no woman has ever been elected POTUS).