In May, the pollster YouGov polled Americans about their feelings on socialism and capitalism. Among Democrats, the two systems polled at about equal:

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This month, YouGov decided to poll the same question. Surprisingly, Democrats now have a more positive view of socialism by double digits:

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Any number of things could explain this poll result, but bear in mind that May was the first full month of the Bernie Sanders campaign, which has unabashedly stood by democratic socialism.