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First, let me state my own bias: Iraq is the whole ballgame. If we can produce a reasonably decent, constitutionally grounded Iraqi government, good things will happen all around the Middle East. If Iraq turns into a quagmire, it will be a disaster for U.S. interests all around the world. So, for me, everything should be focused on getting Iraq on the right path.
This is one part ignorance one part pride. The ignorance part is Domino theory of Democracy. The pride part is the belief that we have to win this fools' errand to save face.