Call it "The Empty Chair Convention." Rick Klein, Senior Washington Editor of ABC News, just tweeted out this photo of the stage the Democrat convention will be held on (posted above). As you can see, Klein's photo reveals the screens that will serve as the television backdrop behind whoever's speaking -- and it looks to me as though the Democrats intend to show an artificial sea of faces in order to make the convention hall look a whole lot more fuller than it might be. If you look closely, they have three tiers of adoring, enraptured Obama-worshippers at the ready...