When Nissan announced the Leaf RC we, naturally, were expecting a little radio controlled version of the battery-electric sedan that's making its way to driveways now -- slowly. We certainly didn't expect a race version of the thing, but that's what Nissan created, and now here it is at the New York International Auto Show, sitting on a turntable and spinning away. In fact you could envision that spinning stretching it out. It's rather longer than the