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I read a little of that article. The scientist interviewed claims he never said Kennewick Man was a caucasian, only that he had cuacasian-like features. Also said that a more detailed study of the skull revealed features more similar to those of northern Japanesse Ainu. Later in the article, it says the current theory about the origin of Indians is that they arrived by boat, not a land bridge.

Addendum to my post #9.

No Europeans. That's a journalists' fantasy.

"European-like" is a term often used for the Ainu of northern Japan. It relates to more hair, lighter skin color, and longer, narrower cranium. These physical features do not indicate descent.

The current "Early Coastal Migration" theory suggests that the earliest west coast folks arrived by boat. Later folks came over the land bridge as has been theorized for a century or more.

This still leaves open the question of the origin of haplogroup X, which might have been even earlier (see Oppenheimer's nice website with the moving lines).

There should be a lot more on this in the near future. The theoretical dam has been broken and data is flowing at a good clip.