Okay, perhaps Edwards just wanted to avoid the dazed and teary-eyed look most celebrities opt for in their mug shots. That doesn't make these photos, which were taken earlier this month after Edwards was indicted on conspiracy and campaign finance violations, less unnerving.
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By looking dour and unsmiling, it would have made the photo uncharacteristic of Edwards' vast archive of publicly available photos and therefore iconic. By making this photo just like a billion others of him (tie, Ken hair, smile), it is rendered unremrkable, unidentifiable, and easily forgotten.