I'm thinking that maybe the reason that a large number of people want to sit in the middle is not becuase that is truly where they want to be, but becuase they consider that picking the middle-ground is the most sophisticated or intelligent thing to do. The middle in only the middle becuase of where the two parties are (in the US I mean). Thats the principle we're all taught in pre-school. When two people fight, neither is right. They're both wrong just for fighting, and the actual circumstances are irrelevant.
Either that, or a very large number of people have become enlightened over night, and have transcended partisan politics in pursuit of.....something greater? Wiser?
But then again, I could be wrong. Maybe the way forward is to pick a spot squarly in the middle of whatever situtation you happen to be placed in. For me, if you're not anything, you're nothing.
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I would consider myself a Lefty, and yet I agree (on matters of foreign policy) more with the ultra-right (isolationists) than with the the Republican mainstream ala ****. This is mostly due to the fact that they arrive at the same result, and not becuase they get there by the same path.