Sociologists claim we can only know about 150 people well; from them, we derive our sense of community and family. The downside is that it means most of us live in positive feedback loops in which everyone we talk with mostly shares our same worldview. That can be deadly for politicians and political parties.

When Sen. Elizabeth Warren writes in the New York Times (as she did recently) that the reason Democrats are suffering in opinion polls is because they haven’t moved far enough or fast enough to the far Left, she illustrates the problem. Everything that the Massachusetts Democrat hears from her family, friends, colleagues, donors, and employees reinforces her ideological bias.