Why Democrats Can't Blame Gerrymandering

What’s hurting Democrats is “clumping,” which means the party is increasingly rolling up huge margins in small geographic areas.
Partisan gerrymandering isn't  that easy.

The Upshot's Nate Cohn has a nice item explaining why gerrymandering isn't responsible for Republican majorities in the House (for more on this argument, see an old John Sides post). Dave Weigel has a good response, arguing that yes, gerrymandering is the culprit. Who is correct? They both are! But Cohn is, on the whole, more correct.

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