Che Guevara may make for a popular T-shirt, but his policy views ought to have no serious role in the national discourse. Likewise, some on the American left just can’t shake their fondness for Marxists, but central planning combined with authoritarianism should have no standing in America’s policy debates. Elizabeth Warren may share common cause with folks who celebrate communist dictators, but giving those views legitimacy in the U.S. Capitol reflects poorly on her judgment.