Matthew Yglesias, Neo-Confederate?

Reporting the findings of a recent academic analysis, our “progressive” (nudge, nudge) friend concludes:

The basic story here would be something like northern manufacturing interests wanted to keep the southern client base behind the US tariff wall in order to maintain privileged access to the market rather than compete on a level playing field with British goods.

Denunciation by the Southern Poverty Law Center in 3, 2, 1 . . .