Denied a Security Clearance?!? He must have had some real dirt in his past. A security clearance use to be difficult to get, but the requirements were gutted during the Clinton years, (rumor has it because the vast majority of his team would have been rejected otherwise.) Now days very little can actually cause you to be rejected, short of an extensive criminal history, things that, in the past, would result in a quick rejection like drug use, mental illness, sexual deviancy and financial problems have been all but removed as factors except in the most extreme cases.
Those factors are resume-enhancement (hell, resume-REQUIREMENTS) for the Oboma administration in today's world!