Ike, a couple of the things that Johnson points out are 1) the stories about Harding’s marital infidelities were all bunk and have been disproved and 2) Coolidge’s great personal tragedy was the death of his son midway through his Presidency, which seems to have had a lasting effect on his personality, and which is evidence that the man had a sex life. Coolidge, incidentally, was deeply attached to his wife; she played a much more prominent role in his life and Presidency than is generally known.
By the way, jwg, I agree with you in ranking Eisenhower as most underrated. A good case could be made for McKinley as well.
Quote from Johnson:
“The deconstruction of the real Harding and his reconstruction as a crook, a philanderer, and a sleazy no-good was an exemplary example of false historiography. It began in 1924 with a series of articles in the New Republic by its imaginative and violently anti-business editor, Bruce Bliven…it is not surprising that Bliven went on to become a credulous propagandist for the Communist-run Popular Front.”