On Halloween night in Washington, D.C., in the 1970s, children out for trick- or-treat stopped by the elegant N Street townhouse of Averell and Pamela Harriman. They were greeted by a maid in a white apron holding a silver tray full of dimes. How novel! The wealthy Harrimans -- Pamela was the daughter of a British baron, Averell a financier and former Governor of New York -- were handing out money instead of candy. But not a lot. The maid cautioned: "Just one dime each."
Pamela Digby Churchill Hayward Harriman, Democratic Party power hostess, widow of multimillionaire Averell, and currently U.S....