Not all campaign books are treated equally. Just look at Edward Klein and J.H. Hatfield.Klein, of course, is the author of the new book "The Amateur: Barack Obama in the White House." Hatfield, now dead and forgotten, wrote a book about George W. Bush, "Fortunate Son," during the 2000 presidential contest.Klein's book, which debuted in early May, has been mostly ignored by large media organizations (although not by the book-buying public, which has put it at the top of the best-seller list). Hatfield's book, on the other hand, rocked a presidential campaign - before crashing and burning on its own …