Republicans like to talk about impeaching President Obama, but there is a far more deserving candidate for impeachment—Chief Justice John Roberts of the Supreme Court. While the Republicans in Congress have blocked Democrats from enacting much of substance, the GOP majority in control of the Court has been effectively legislating on its own, following an agenda neatly aligned with their conservative party. Step by step, the five right-wing justices are transforming the terms of the American political system—including the Constitution. They empowered “dark money” in politics and produced the $4 billion by-election of 2014. They assigned spiritual values to soulless...