By Chris Casteel Staff Writer ccasteel@oklahoman.comThe referendum petition being circulated to repeal taxes passed by the Legislature is valid, and a protest filed by the Association of Professional Oklahoma Educators should be rejected, the Oklahoma attorney general's office argued Friday to the Oklahoma Supreme Court. In written arguments, Oklahoma Attorney General Mike Hunter's office said the state Constitution has always afforded broad protection to the right of citizens to seek a referendum on legislation.Read more on NewsOK.com