Obama could not qualify for any security clearance if he had to go through the door like everyone else. I want to know why every candidate for President does not have to have a background check like they require for Top Secret. Let each candidate fill out the form that some of us had to fill out every five years to keep the clearance. If they cannot pass it, then they cannot run for office.
Remember the woman Schroeder (I Think) from CO who whined she was on Armed Services but she was not allowed to hear the black box briefings but expected to vote on the money. Good reason is that she never had the security clearance because there are certain briefings only members with the clearance can hear.
The requirements for President are defined by the Constitution: Age 35 or more, natural born US citizen; that's it.
Security clearances are agency requirements and cannot supersede the Constitution. It's up to the voters not to elect a Marxist to office, unless that's their choice.