I actually did some research into this event, apparently there were scores of people, and they had a fairly decent run of a small portion of the White House, unsupervised. He's the video, where the people who committed the tasteless acts can be seen:
http://www.youtube.com/watch?v=gaQ-e-It0kM&feature=player_embedded#!
I not seeing how this is pinned on Barry.
You can tell from that video that they were unsupervised?
I doubt any civilians are ever unsupervised in the WH.