Regardless of whether one agrees with the result, structurally sound opinions always confront binding legal precedent. Walker's is a clear exception because the U.S. Supreme Court has spoken on whether a state's refusal to authorize same-sex marriage violates the equal protection and due process clauses of the 14th Amendment. In 1972, Baker v. Nelson, a case over whether Minnesota violated the Constitution by issuing marriage licenses only to opposite-sex couples, was unanimously thrown out on the merits, for lack of a substantial federal question. The Supreme Court's action establishes a binding precedent in favor of Proposition 8. But Judge Walker's ruling doesn't mention Baker, much less attempt to distinguish it or accept its findings.
Judge Walker did not look at previous Supreme Court rulings. Precedent matters. I hope Justice Kennedy will look to Baker v. Nelson and let a previous ruling stand.
Washington Post article here.