What can we know of our fellow citizens? The question is at root philosophical or epistemological. In the peculiar climate fostered by the Trump regime, however—not to mention the recent Cambridge Analytica scandal—it has also become a political one. Everything from the trustworthiness of social scientific indicators to the facticity of the news media to the techniques by which candidates reach voters is now subject to suspicion. The means by which we know “the public” is, today, a central public debate.

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