In Washington, bigwigs can misspeak and misstep a million times without drawing attention. And then there are the seemingly harmless moments that stick to a person like super glue: Joe Wilson barking “You lie!”; Jesse Jackson mumbling into a hot mic that he wants to castrate Barack Obama; Dan Quayle trying to spell things. Like coal crushed into diamonds by the pressure of a million eyeballs, such moments are forever. During an exclusive dinner hosted Monday by the Alfalfa Club, Obama adviser Valerie Jarret had just such a moment. And were it not for an irritated tipster, Jarret might have...