Colin Powell and Condi Rice are both reviled for their roles in the Iraq lie. As far as I know they are still considered examples of racial progress, despite this fact.
http://www.factcheck.org/bushs_16_words_on_iraq_uranium.html
There's probably no-one truly objective on the subject, as politics are entwined in every aspect... but Clarke worked under four administrations. Tenet's book sheds light on the subject as well.
While some were truly evil, I tend to believe that Bush wanted to believe it enough that he convinced himself of it. The human mind is a subject of its own.