Ed Rendell recently whacked Elizabeth Warren when she bashed Joe Biden for taking rich donors’ money. The former Pennsylvania governor wrote that he himself had run a “swanky” fundraiser for Warren’s Senate race, for which she thanked him royally. Furthermore, she transferred $10.4 million of her big-money hauls into her presidential campaign while bragging that she was only accepting small donations. Calling that maneuvering sleazy would be overdoing it, but there is certainly something untoward about it. Warren refuses to say what taxes she would raise to cover her “Medicare for All” health care plan. Bernie Sanders’ similar vision —...