Amanda Marcotte pins the tail on the elephant:
I think it helps to understand that, for right-wing populists, this thing we call "history" is less about real people who did real things in the real world, and more like just the Bible Part II. It's a myth that can be manipulated to suit their purpose, which is usually to establish themselves as the only Real Americans. When Palin says she got it right, I believe she believes that, because her story wasn't really about Paul Revere. Her story was a thinly veiled allegory of the Tea Party worldview, and in it, Tea Partiers are Paul Revere and the British stand in for Obama, the foreign usurper who is out to take their guns.
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The Dish 