That wasn't just a one-time remark. Here he is in Oklahoma, repeating the line that "you can't put a gun rack in a Volt" along with his call for $2.50/gallon gas. His supporters think this line is a winner, as his own superPAC put the video on their own YouTube channel.
President Obama has already taken care of debunking Gingrich's call for cheap gas, but what about it being impossible to put a gun rack in a Volt? Yes, you can.