As a thorough ally, my only earnest question is whether America is too homophobic for a gay man to reach the finish line. I sincerely think Hillary Clinton would have had the needed margin had she been male. He will have similar entrenched resistance.
I think he projects a bit of elitism via intelligence, and he’s a bit too truly “liberal” for me, but at present his seeming competence and good communication heavily counterbalance that. He’s still one of several who wouldn’t bother me to be top of the ticket.