The Declaration of Independence and the Second Amendment share something in common; they both have preambles. The Second Amendment is the only amendment enumerated in the Bill of Rights that contains a stated purpose, "A well regulated Militia, being necessary to the security of a free State..." This is a preamble, an introduction, a preface, a whereas,--not a therefore. "What is special about the Amendment is the inclusion of an opening clause--a preamble, if you will...No other clause is a part of any other Amendment." L. Tribe, American Constitutional Law. "Many gun control advocates argue that the unique 13-word preamble...