The death of Antonin Scalia has set up a nasty battle over who shall occupy his vacant seat on the Supreme Court. The battle does not just involve the endless political skirmishes now taking place between the White House and the Senate. It also extends to the larger philosophical debate over the constitutional theory of originalism, with which Justice Scalia was so closely associated. Few of the attacks on originalism and Scalia have been as tasteless and ignorant as “Looking Back,” the broadside that the journalist Jeffrey Toobin recently published in The New Yorker.