It was the altitude. Yeah, that’s it.

As liberal pundits cringed Wednesday night over President Obama’s debate performance, Al Gore leapt to his defense with a curious explanation.

If Obama seemed like he had his head in the clouds, the former VP reasoned, perhaps it was because he was having trouble adjusting to the Mile-High City.

“I’m going to say something controversial here,” Gore said on Current TV, the channel he helped found. “Obama arrived in Denver at 2 p.m. today, just a few hours before the debate started. 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 …”