If one is to win an argument, one must be able to think clearly and sensibly. In many ways, it appears this is why Glenn Ellmers wrote his new book, “The Soul of Politics: Harry V. Jaffa and the Fight for America.” Yes, the book is about Harry Jaffa, the conservative professor, thinker, and political philosopher of the mid- to late-20th century, but it is hardly a biography. The book does touch slightly on his personal life, but it is primarily an exposition on how Jaffa thought, or how he came to think the way he did, and how that thinking has influenced so many now. Classical Philosophy Versus Modern Philosophy Jaffa, along with his predecessor and teacher Leo Strauss, worked to bring back classical political philosophy to the forefront where modern political philosophy had reigned for decades, if not centuries. Ellmers identifies early in the book a significant moment …