Often he acted not by following any grand design but by sheer instinct, hastily improvising. . .He deliberately fostered disarray among his own people. . .Disorder, delays, and muddle were frequently the watchwords; problems were met principally by improvisation, not long-term strategy.
He is referring, of course to FDR. FDR was also a wealthy man who was highly regarded by non-affluent voters. He used new media effectively (radio was new at the time). And some of his political opponents really, really hated him.
The book is 1944.