Nowhere that I can find.
"A well regulated Militia, being NECESSARY to the security of a free State, the RIGHT of the people to keep and bear Arms, SHALL NOT be infringed."
These folks seem to miss the point that Romney banned the exact sort of weaponry that the British went out to Lexington and Concord to try and confiscate.
Somehow I don't think ANY of the founding generation would be amused.
You are right, they would not.
"The best we can hope for concerning the people at large is that they be properly armed."
Alexander Hamilton
Laws that forbid the carrying of arms... disarm only those who are neither inclined nor determined to commit crimes... Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man.
Thomas Jefferson