Is asymmetrical polarization real?

Since the mid-aughts, both parties have mostly shifted left

If you’d asked me about political polarization five or maybe even three years ago, I would have hastily broken in to say that you have to keep in mind this is “asymmetrical polarization” we are looking at.

This is something that clearly popped out of Keith Poole and Howard Rosenthal’s quantitative work on measuring congressional ideology with a system c…

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