I bet Republicans would do a lot better with the black vote than usual, since Scott is black and Bernie is not liked by black voters.
The black vote is incredibly inelastic. What minimal gains Scott could make with likely come mostly from socially conservative blacks in the deep south, where the states are republican anyway. I think Scott would have done better than Trump in VA (especially since rich suburbanite preferred Clinton to Sanders) and maybe FL (I would think having a literal socialist on the democrat ticket would result in Cubans voting republican in huge numbers), but Scott's economic policies are typical GOP establishment corporatism. I'm not sure why so many people have him winning PA. He's also not the best at rallying the base. He's really only well known for being a black republican, unlike say Cruz, who doesn't need to focus on being hispanic because he's known for his conservative record and antics.
