Actually, never mind for part of this. I had assumed they were using the median to divide between conservative and liberal in which case people who identified as moderate would be thrown out, but they're using the mean which is most likely a number in between the possible options, so everybody gets included. Moderates are included with either liberals or conservatives; I'm not sure which.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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