Check his record before you think he can win a general election. No, not impossible, but unlikely for sure. He’s a radical leftist. Those types don’t fair well in national elections.
He reminds me of Jesse Jackson, who was also popular in various midwestern states but didn’t even get on the ticket, in the end.
I think that if he seems to be a serious contender, his record and associates (such as his black power “church”) will come to light, and then I doubt there will be a non-black person in the country (well, except for some self-hating Jewish and Catholic liberals) who will vote for him. And even if all the blacks in teh country voted for him, that’s not enough to elect him.
Plus, I’m sure there are many blacks, even black Dems, who are not thrilled with either his covert Muslim persona or his radical leftism.