Is Nader Off His Rocker?

Obama's communications director Robert Gibbs calls Nader's remarks "reprehensible."
Presidential candidate Ralph Nader made the following comment about fellow candidate Barack Obama in an interview with The Rocky Mountain News:
He wants to show that he is not a threatening ... another politically threatening African-American politician. He wants to appeal to white guilt. You appeal to white guilt not by coming on as black is beautiful, black is powerful. Basically he’s coming on as someone who is not going to threaten the white power structure, whether it’s corporate or whether it’s simply oligarchic. And they love it. Whites just eat it up.
Robert Gibbs, Obama's communications director, spoke about Nader's attack, calling it "reprehensible and basically delusional."

What do you think? Is Barack "appealing to white guilt," or is Nader just looking for attention? Do you think Nader's comments can be construed as racist; or that he is just calling it the way he sees it? What do you think would have happened if these comments had come from McCain's campaign?