[Sherman Logan]

If you accept the idiotic and racist one-drop theory, as white racists of the last century and black racists of this century do, then Obama’s momma was also black. So he isn’t half white after all.

What a relief.

[Verginius Rufus]

For Bryan Sykes' new book, DNA USA, he collected genetic samples from many Americans of different racial backgrounds. Some of the people who thought they had 100% European ancestry turned out to have a small amount of African DNA. But it doesn't necessarily mean descent from someone who was a slave in America--it could be from an ancestor taken to Europe many centuries ago (there were black slaves in the Roman Empire and some of them ended up in Roman Britain and there black slaves brought to Europe in later periods as well).