Even before I heard Chris Matthews mention it, it struck me too . . . Among the visuals a big-time campaign carefully choreographs is the human backdrop when the candidate speaks—particularly when it's a matter of an important, nationally-televised speech. So it's very hard to imagine that it was coincidence that the crowd visible behind Hillary this evening as she gave her Kentucky primary victory speech . . . was comprised 100% of people of pallor. Kibitzing with co-anchor Keith Olbermann immediately after Clinton's comments, Matthews mentioned it. CHRIS MATTHEWS: I thought a giveaway line was "who is best positioned...