Dude seriously. Fourth time. The wave is the reasoning. The mere fact that he's running indicates the motivation. If I don't look at it from that perspective, the only other is this "hope" business, even though we don't know what he is hopeful for.
And no, you've got it backwards, I think he's running to become president to ride the wave first and foremost, not because he's black. Many politicians would go the same route he did if they had such a splashy win in '04. Has nothing to do with the color of his skin. The color of his skin only gives it historical significance.
