By and large, historians have credited President Franklin D. Roosevelt and his New Deal for getting the United States out of the Great Depression. From time to time salvos are lobbed from conservative bunkers, such as Amity Shlaes’ anti-New Deal tome of last year, The Forgotten Man. But like so many other books of its kind, it failed to land a lethal hit, and meanwhile the ranks of New Deal defenders continue to be replenished.