Only if the case involves a question of federal law. If the case is concerned with only state law, then the buck stops at the state supreme court. And even if

Only if the case involves a question of federal law. If the case is concerned with only state law, then the buck stops at the state supreme court. And even if the case raises questions concerning the US Constitution or other federal law, the US Supreme Court defers to the state supreme court for interpreting state law.