Margin is about 4 percent for Hillary. Trump’s victory is crushing.
Sanders won the majority of Hispanics, but African Americans broke hard for Clinton.
It seems unlikely that Sanders will win South Carolina, given the make-up of its primary voters.
Much of this depends upon whether Bernie’s momentum in the polls continues. African Americans are an important constituency, but if he can extend his numbers with Hispanics and women, he’ll be in good shape.
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As for Trump, I don’t see a scenario that doesn’t involve his health, where he isn’t the Republican presidential candidate.
If he runs against Clinton, a lot of Sanders working class voters are going to vote for him, not Clinton, but his bashing of minorities may cost him the election. Unlike mainstream pundits, I am not 100 percent certain of that: After all, mainstream pundits also said there was no way Trump could win a primary.
(Update: I wasn’t going to comment on Jeb dropping out since he’s been such a non-factor, but I think it’s worth noting that he did speak out against Trump’s demonization of Hispanics and his anti-Muslim ban. That said, the fact that Trump said George Bush Jr. lied the US into Iraq and still won this primary is revealing.)