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That there are more opportunities than ever for citizens to express their views may be, counterintuitively, a problem facing democracy—the sheer quantitative overabundance overloads policymakers and citizens, making it difficult to detect the signal amid the noise. This overload has been accompanied by marked decline in civility and argumentative complexity. Uncivil behavior by elites and pathological mass communication reinforce each other. How do we break this vicious cycle? Asking elites to behave better is futile so long as there is a public ripe to be polarized and exploited by demagogues and media manipulators. Thus, any response has to involve ordinary citizens; but are they up to the task? Social science on “deliberative democracy” offers reasons for optimism about citizens' capacity to avoid polarization and manipulation and to make sound decisions. The real world of democratic politics is currently far …