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David Ono reports from the 2012 RNC

<div class="meta "><span class="caption-text ">Clint Eastwood talked to an empty chair, which spurred an &#39;invisible Obama&#39; Twitter trend, and upstaged Mitt Romney at the Republican National Convention on Aug. 30, 2012. (RNC)</span></div>
August 28, 2012 12:00:00 AM PDT