Move to the center. That's the advice Republicans are getting from quarters friendly and otherwise. It seems to make a certain amount of sense. If opinion is arrayed along a single-dimension, left-to-right spectrum and clustered in the middle in a bell-curve pattern, then a party on the right needs only to move a few steps toward the center or just beyond to convert itself from minority to majority status.

But the world is a lot more complicated than that. Opinion is not arrayed on a s ...

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