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What this man was saying was that it was better to have been wrong about Iraq than to have been right. That's the prevailing (though not always conscious) consensus in Washington, and it's completely insane.
And, basically, this is because a bunch of liberal-to-moderate hawks considered support for the Iraq war to be a testosterone test - whether or not you had the cojones to kill a few people and send someone else's kids off to war for the good old USA.