Argument to defend marriage law

The Obama administration says that it will no longer defend the constitutionality of federal marriage law. If the matter were really being settled by the soundness of the legal arguments, then no additional briefs should be necessary anyway. The Obama DoJ has already written its brief on the subject, and you can find it here and here. Any judge just could just read this brief, regard of how Obama is shifting his political stances. That will not happen, because the dispute is political and the court action is a smokescreen.