Unlike Noel, I don't have any deep thoughts to offer about the next Democratic primary.
However, I do have some shallow thoughts.
The "nice" line. It exists. The primaries have demonstrated it. There's a mathematical theorem which states, loosely paraphrased, that if you're above zero on one side, and below zero on the other, there's going to be a point in between which is exactly zero. The question is, where does the zero line run? My guess is that it runs roughly from Michael Moore's Flint, Michigan, around Eminem's Eight Mile, cutting down to Fort Wayne, Indiana (home to fictional M*A*S*H wingnut Frank Burns), then to Muncie, where the famous Middletown sociological study was performed in the 1920s, which of course omitted blacks and Jews. Indianapolis is a question mark in my mind, but the line probably spills into the Ohio River along the Kentucky border, and there are likely blobs of naughtiness scattered hither and thither throughout Indiana, like cold patches on a weather map. After all, the Klan did run Indiana for years.
Why does the line exist? I sure as hell don't know. But as Eldridge Cleaver once said, "The onus of teaching racial supremacy and hate, which is the white man's burden, is pretty hard to bear." It's like entire states have decided, screw this, I'm getting a brewski.
The Bikhchandani cascade. A few days ago, I wondered why more superdelegates hadn't broke for Obama yet. Then I saw this chart. It looks a lot like a current versus time graph for an RL circuit -- um, a direct current electric circuit made of a resistor and an inductor. The inductor generates a magnetic field when current passes through. If you lower the voltage, the current doesn't ebb immediately, since the energy stored in the magnetic field needs to be released. On a graph, it looks like a decay curve to a new level.
You can play all sorts of goofy sociophysics games with this analogy.
The jump to the right. When Edwards was in the Democratic primary campaign, running as a left-leaning populist -- which I found unconvincing, unlike the rest of the Internet, but like most of everyone else -- policy on the Democratic side jinked to the left as well. Now Clinton is trying to stake out territory to the right of Obama. This is a little reminiscent of Romney's stated desire to double Gitmo Gitmo, as if he were playing blackjack or something. Should she win the nomination, it might be an interesting strategy to try against McCain.