ROCK HILL, S.C.—Gavin Newsom, who is definitely running for president, is probably—inscrutably, appallingly—the early favorite to win the Democratic nomination in 2028. On a Monday night in South Carolina, several hundred angsty boomers have turned out to hear the greased-up California governor talk about his favorite subject: himself. The early primary state is one of the first stops on Newsom's book tour for Young Man in a Hurry , his recently published "memoir of discovery." Newsom radiates