His biggest legacy may well be whites will hesitate to ever vote for a black for a national office.
Unfortunate, but why do +90% of blacks vote for Obama? There is no other reason to explain than racism.
More than that .. it may (probably will) demonstrate to many that the derogatory things said about that particular demographic are in fact true and that those who think less of that particular demographic were/are right after all.
I have heard quite a few people say recently in conversations ... "I wasn't a racist before ... but I am now"
That's precisely what the Democrat kingmakers and the mainstream media have been trying to prevent for six long years. In their eyes, from the very beginning, the "first (liberal) black president" must be not just a success, but a spectacular success. So they cover for his failures by trying constantly to bend reality itself.
Of course, they would never go to these lengths to protect the "legacy" of a conservative black president.