Evolution is as well documented as any phenomenon in science, as strongly as the earth's revolution around the sun rather than vice versa. In this sense, we can call evolution a "fact." (Science does not deal in certainty, so "fact" can only mean a proposition affirmed to such a high degree that it would be perverse to withhold one's provisional assent.)
Dubya's answer to Gould would seem to be that science, unlike morality, is a cafeteria of personal choices. What Chatterbox doesn't understand is how a presidential candidate can argue this position and still be taken seriously as an education reformer.