Where the Modoc People Came From

In an ad for himself, the Rev. Al says, "Unless you're a Native American, you came here from someplace else."  Where does he think the American Indian tribes came from?

Humans originated only in Africa, most scientists believe, and then spread out, and the American Indians came to this continent from Asia. But I should rethink that, because Caucasians and Asians carry some Neanderthal genes. That species--the Neanderthals--apparently originated in Europe, and it has been found in Asia. It must have evolved from African genes similar to our own. That made it possible for the two species to interbreed.  But no Neanderthal remains have been found in Africa, and pure Africans do not carry Neanderthal genes. The rest of us can claim that a little bit of us came from Europe or Asia--is that the right way to look at it?