JOHN H. MCWHORTER has joined a club to which few desire admittance. Though the 34-year-old Berkeley linguistics professor does not consider himself a black conservative, he has written a book, Losing the Race: Self-Sabotage in Black America) ," that is guaranteed to get him the same reception that Thomas Sowell, Shelby Steele, Walter Williams and Clarence Thomas have endured. It is a brave and very honest book. But one is forced to wonder, sadly: Will anyone listen? McWhorter is an intellectually gifted man who was fortunate enough to be born to black parents who encouraged his industry and curiosity. It ...