Dripping to the End

After Tuesday's results, I kind of expected a Wednesday superdelegate flood to Barack Obama. It didn't really materialize, though he did pick up some ground. And Thursday was the same way. And now looking at my inbox, it seems like more of the same as Rep. Peter DeFazio endorses Obama while Rep. Donald Payne switches from Clinton to Obama. Stuff on this scale doesn't -- and can't -- lead to a knockout blow, it's more of a death by a thousand cuts thing with the handful of superdelegate defections being especially damaging.