Can a self-proclaimed socialist win the moderates and independents necessary to beat President Trump? Bernie Sanders’s supporters seem to think so. Indeed, some have even taken to calling Sanders “the unity candidate.”

Sanders’s sweeping victory in Nevada, combined with his win in New Hampshire and his tie in Iowa with Pete Buttigieg, proves that his campaign has built a grassroots coalition of young and minority voters. But Sanders is still a controversial pick, even among Democratic voters eager to see Trump defeated. Nevada’s largest union, for example, openly opposed Sanders ahead of the caucus, arguing that his radical “Medicare for all” proposal would hurt union workers more than it would help them.