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Yes, Glenn, the move to the center cliche is just a smokescreen. The whole point of this exercise is for Obama to demonstrate to the corporate ruling class that is is safe, that he will, like Steny Hoyer and Pelosi, take direction. The ruling class has governed through the republicans so ruthlessly that it has, as even the republicans admit, destroyed their brand. They are now considering whether to govern through the democrats--but need Obama to demonstrate that he will knuckle under. The FISA vote is a good litmus test for them.
They don't really trust McCain--notice how they even tried to prop up Fred Thompson in his place--and could never abide Clinton. Now that the ruling class has pushed Clinton off the stage and sees how erratic McCain is, they are probably looking to make a deal with Obama. That's what this is all about.