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A voter holds an ‘I Voted’ sticker on index finger in front of ‘Vote Here’ sign outside a polling location in Berkeley, California, November 6, 2012 (Credit: Daniel Parks via Flickr)

A voter holds an 'I Voted' sticker on index finger in front of 'Vote Here' sign outside a polling location in Berkeley, California, November 6, 2012 (Credit: Daniel Parks via Flickr)