Pay no attention to that woman behind the curtain. Be afraid. Be very afraid, for if you don’t obey the Great and Powerful Oz will turn her wrath on you. Yawn. Hillary Clinton’s favorite girlhood movie was the “Wizard of Oz.” But now, as the primaries clank along, her subjects are refusing to wear the green-tinted glasses and buy her act. She’s less and less terrifying every day, and fewer of those closest to her -- her Senate colleagues -- are intimidated. Despite their best efforts, the Clintons' powers seem to have gone on the fritz, and those Democrats who...