Politico: What is Clinton’s argument now?

Washington, D.C. (Politico.com): Hillary Clinton does not lack for victories. She has had several recently.
What she lacks is a way to make her victories meaningful. What she lacks is an argument.
What is the game-changing argument that will cause the superdelegates, who will decide the Democratic nomination, to vote for her?
That she has won Ohio, Texas, [...]