A recently released study that’s making the rounds in political circles confirms what’s been apparent for years: A significant percentage of leftists are mentally ill. Conducted by researchers from Tufts and Yale Universities, the study published April 30 found that conservatives self-reported having higher rates of “positive” mental health than their liberal counterparts. According to a graphic summarizing the data released by left-wing election statistician Nate Silver, 51 percent of conservatives described themselves as having “excellent” mental heath, while only 20 percent of liberals said the same. A similar dynamic also exists among those who self-reported having bad mental health....