This is his explanation, take it or leave it:
"Obama arrived in Denver at 2 p.m. today - just a few hours before the debate started," Al Gore explained on his Current TV Network. "Romney did his debate prep in Denver. When you go to 5,000 feet and you only have a few hours to adjust -- I don't know."Well, so we get here a clear image of a sea level plains dweller being suddenly whisked to the mountain, where lack of oxygen has done him in.
Another good analogy would be a beached whale, but I can see why Mr Gore would prefer to keep it in reserve:
Anyway, an idea for the next debate: to make the playing field level, the contenders should meet underwater, after being kept in same conditions - food, exercise, sleep etc - for a week at least. Fair is fair.
And together in one room.