May 2, 2014 11:36 AM EDT

The Independent Senator from Vermont is the only member of the chamber who proudly identifies himself as a socialist, and on Twitter he’s a loud conscience for liberal principles. He highlights poverty statistics, tweaks his colleagues for voting against veterans’ benefits and slams the industrialist Koch brothers for their political spending. At a time when political and economic populism has grown in fits and starts, Sanders is a voice consistently railing against inequality. —Dan Hirschhorn

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