Concerned murmurs of “populism” hang over many political movements that emerged in 2016. The word littered headlines, describing political parties, politicians and popular movements in the US, UK, Spain, Italy and the Philippines, among others. As far as “isms” go, ...

When Pablo Iglesias beat out his deputy and philosophical counterweight Errejón for leadership of Podemos in early February, he made a muted note of the party’s ongoing spiritual crisis: “There’s no doubt we’ve made a lot of mistakes,” Iglesias said, ...