"A line already snaked around the building shortly after the three-day event began at 3 p.m., and the parking lot was jammed" at the Dulles Expo Center in Chantilly, Va., wrote Justin Jouvenal of The Washington Post:

"With an AK-47 slung over one shoulder, Marco Hernandez offered one word when asked why he was in the overflow crowd at the gun show."

"Obama," he said. "I wouldn't be here if it weren't for the possible gun ban."

And this is the story across America since Sandy Hook.

The weapon most in demand at Chantilly?