The mainstream media and the Democratic Party have gleefully counted on support from the black community for years. Their messaging has been clear: At best, Republicans don’t care about black people, and at worst, are made up largely of racists. Unless you want to betray your race, you must vote Democrat. So, you can imagine Democrats’ dismay at the growing movement of black Americans who are — as some have put it — leaving the Democratic plantation after waking up to the fact that the Democratic Party is bad news for African-Americans. That brings us to Antonia Okafor. She’s a...