As the mayoral campaign of Bill de Blasio moves on, the revelation that the likely victor was a Sandinista supporter as a young man in the 1980s has begun to be noticed. It made de Blasio actually have to respond to his Republican opponent, Joe Lhota, who had condemned him as a “Marxist.” But instead of saying something to the effect that he was young, idealistic, and perhaps wrong about Nicaragua, he openly defended his positions.In an interview with Capital, a Manhattan-based publication, de Blasio argued that U.S. policies in Central America in the ’80s “were wrong,” and that...