The New York Times weighs in:
The justices appeared to clash over not only what is the right answer in the case but also over how to reach it. The questioning illuminated their conflicting views on history, tradition, biology, constitutional interpretation, the democratic process and the role of the courts in prodding social change. Justice Kennedy said he was concerned about changing a conception of marriage that has persisted for so many years. Later, though, he expressed qualms about excluding gay families from what he called a noble and sacred institution. Chief Justice John G. Roberts Jr. worried about shutting down a fast-moving societal debate.
Justice Samuel A. Alito Jr. asked whether groups of four people must be allowed to marry, while Justice Antonin Scalia said a ruling for same-sex marriage might require some members of the clergy to perform ceremonies that violate their religious teaching. Justice Stephen G. Breyer described marriage as a fundamental liberty. And Justices Ruth Bader Ginsburg and Elena Kagan said that allowing same-sex marriage would do no harm to the marriages of opposite-sex couples.
At the start of Tuesday’s arguments, Chief Justice Roberts said he had looked up definitions of marriage and had been unable to find one written before a dozen years ago that did not define it as between a man and a woman. “If you succeed, that definition will not be operable,” the Chief Justice said. “You are not seeking to join the institution. You are seeking to change the institution.”