Americans attitudes towards free trade have rapidly polarised, per FT:

Part of Trump's success stems from his ability to cleave liberals away from popular mainstream positions purely by virtue of negative polarization.

I'd love to see farther back to where conservatives were before Trump. Notably it's not just liberals, look at how moderates are shifting.

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Well today's "conservatives" might be the Obama voters of 2008/2012. This is what political realignment does.