Mr. Ginsberg is too loyal a Clintonite to state plainly that Mr. Gore’s 'friend deficit,' as he delicately puts it, made him ill-suited to the presidency. But clearly it signaled a problem. It is a problem that, as Mr. Ginsberg shows, presidents usually manage to avoid. This is Mr. Ginsberg’s first book after a career as a communications executive at various companies, including News Corp. The book’s strongest chapters relate friendships in which the president might have been expected to lose touch with an old friend but didn’t, and in which the friend never tried to take advantage of his valuable new connection.