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Most memorable moments from past conventions

Actor Clint Eastwood, billed as a mystery guest on the schedule, talks to an empty chair as he addresses an 'invisible' President Barack Obama during the 2012 Republican National Convention at the Tampa Bay Times Forum on Aug. 30, 2012, in Tampa, Fla. Eastwood's ad-libbed monologue spawned the Twitter handle "Invisible Obama" which gained 20,000 followers in the first hour and many comedic takes.
The Washington Post via Getty Images

August 20, 2012, 6:06 PM

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