Buttigieg is a public school teacher by day and a social media superstar by night. He boasts 381,000 Twitter followers —about half as many as Democratic presidential candidates Andrew Yang and Sen. Amy Klobuchar and just enough to match Julián Castro. And he’s not even the one running. Buttigieg's online popularity is attributable largely to just how adorable and supportive he is of the presidential campaign. He regularly tweets encouraging messages during his husband's busy schedule, not to mention he lives a pretty active political life of his own. And, of course, this works with young voters. (As a teacher,...