The more serious question we should ask is whether Darwin, judged by the standards of his day, would have been considered a racist -- or, quite the opposite, as a campaigner, in his own way, for the abolition of slavery based on the conviction that all human beings have a common biological parentage.
That said, even if it were to be demonstrated that Darwin was -- even by the conventions of his day -- a racist, this conclusion may have consequences for our moral evaluation of Darwin as a man; it would contibute nothing to our evaluation of his work as science.
http://www.bbc.co.uk/blogs/ni/2009/0..._a_racist.html