How can top colleges be persuaded to admit more talented low- and middle-income students? My column this week laid out a strategy for making colleges more economically diverse and meritocratic, based on policies at Amherst College and the University of California. But I didn’t spent much time on the politics of getting colleges to make changes. Fortunately, several other writers have done so — some today, in response to the column, and some long before.

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