Today’s ideological division on the U.S. Supreme Court is also a partisan division: all the Court’s liberals were appointed by Democratic presidents, all its conservatives by Republican presidents. That pattern never existed in the Court until 2010, and this book focuses on how it came about and why it’s likely to continue. Its explanation lies in the growing level of political polarization over the last several decades. One effect of polarization is that potential nominees will reflect the dominant ideology of the president’s political party. Correspondingly, the sharpened ideological division between the two political parties has given presidents stronger incentives to give high priority to ideological considerations. In addition to these well-known effects of polarization, The Company They Keep explores what social psychologists have taught us about people’s motivations. Justices take cues primarily from the people who are closest to them and whose approval they care most about: political, social, and professional elites. In an era of strong partisan polarization, elite social networks are largely bifurcated by partisan and ideological elites, and justices such as Clarence Thomas and Ruth Bader Ginsburg live in milieus populated by like-minded elites that reinforce their liberalism or conservatism during their tenure on the Supreme Court. By highlighting and documenting this development, the book provides a new perspective on the Court and its justices.
