Millions of Americans cannot tell you who lived at Mount Vernon or who wrote the Declaration of Independence - let alone the Emancipation Proclamation. But they know that to be 'a Benedict Arnold' is to be a traitor of the deepest dye - someone who coldly betrays not only a sacred cause but every moral scruple along the way.

Do I look stupid?" snarled Uncle Vernon, a bit of fried egg dangling from his bushy mustache.