Mr. Hess is a senior fellow at the Brookings Institution. Editor's Note: Following is a column Mr. Hess wrote in June 1978, when Jimmy Carter was just midway through his term. We think it's worth reprinting. It shows how early Carter's flaws became apparent to eagle-eyed pundits like Mr. Hess. Let us assume that Jimmy Carter is an intelligent, decent, hardworking man. Assume, moreover, that he has appointed to his cabinet and sub-cabinet many men and women who are experienced and dedicated. How, then, can a president - certainly no less mentally alert than most past presidents - with many...