"It's essentially over"

The real kos at Daily Kos, Markos Moulitsas Zuniga, cast his lot with Barack Obama a long time ago.
He's a trustworthy, although biased, evaluator of campaigns, strategies and the primary and electoral process, more so than most mainstream journalists I read, in my experience.
So when he says so, I tend to believe him. Of course, that's because I want to.
Money quote:

Meanwhile, in Iowa Saturday, Clinton lost a delegate while Obama picked up nine of them in the state's county conventions. In Oregon, the state AFSCME broke with the national organization (which endorsed Clinton) and endorsed Obama for its primary. The party's activists continue to move in large numbers toward Obama while Nancy Pelosi has essentially cast her lot with Obama. Clinton supporters are increasingly paranoid as the walls close in on their candidate's campaign, but it's essentially over. They may rail against Pelosi, or the media, or Howard Dean, or Keith Olbermann, or Daily Kos, or whatever and whoever. But what they are seeing is a consolidation of the party around the primary's winner, and that is already Barack Obama whether the Clinton campaign and her shrinking number of supporters wants to acknowledge it or not.