I don't know, mousthief, but does it have to be called a preamble, as opposed to, for instance, a preface or a prologue?

But I agree, there certainly are a lot of people who like to wave around the Constitution who don't even know what's in it. Like John Boehner, for instance. Maddow at least knows what's in it. She appears to just be quibbling with what to call the opening paragraph.