U.S. courts' rulings on marriage have evolved in response to changing norms.
Stephanie Coontz is a teacher of history and family studies at Evergreen State College, Olympia, Wash.
With several state supreme courts due to rule on suits from same-sex couples demanding access to marriage, conservatives must be delighted to have a Justice Samuel Alito. During his confirmation hearings, Alito argued that judges should interpret the Constitution based "on the meaning that someone would have taken…