Obama, Susan Rice, Valerie Jarrett, Eric Holder, and Samantha Power all have TOP SECRET clearances - which require extensive background checks.
Think about that.
There is no way Obozo could have passed a Top Secret clearance background check. He might have one, but it was pencil whipped when he became president. Same thing goes for John Kerry, who testified before Congress that he had participated in war crimes. His was also pencil whipped. The party in power can do any damn thing they want.
Very low? There are 3 basic clearance levels, not 20.
Heck, my C required much more effort on a daily basis at work than my later S. Of course, that could be the difference between contractor and subcontractor....