Former Vice President Al Gore on Wednesday suggested a curious culprit was to blame for President Barack Obama’s lackluster debate performance: Denver’s high altitude.

“I’m going to say something controversial here,” Gore said on Current TV. “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.”

Glenn Beck on his radio program Thursday called Gore’s comment the “greatest excuse of all time.”