To study Jefferson is to ascend a mountain, its peak awash in veiling mists. He was the embodiment of the Enlightment man, the perfect synthesis of classicist, scientist, and visionary. How can we hope to understand such a towering figure? The Sage of Monticello, deified in American politics, speaks across the ages like a patriotic Moses, or Buddha, or Christ.Or so his disciples would have us believe.The real Thomas Jefferson was an ordinary man,...