So it seems a drunk guy managed to wander onto the runway in Dallas. That's quite a trick, getting onto airside, crossing the apron, and heading either down the taxiway or across the rough all the way to the runway. Those expanses of pavement are bigger than they look.
It sounds like someone who released him from a drunk tank may be at fault for leaving him on airside, as opposed to him actually getting through an airside door. But stranger things have happened.
Personally, I would have gone with "little green men" over "Air Force One."