Like many people my age (62), I was taught both at home and in school that Franklin Delano Roosevelt was a great president. FDR, I was taught, saved American democracy in the 1930s with the New Deal and led the nation to victory against Hitlerism in the 1940s. That view of FDR was reinforced by many television documentaries and history books. And virtually every poll of historians — including the most recent C-Span poll — places FDR in the top five of all U.S. presidents (usually in third place behind Lincoln and Washington). This is so despite persuasive revisionist historical...