BROOKE: There was a time most Americans saw identity as fixed:you were black or white, straight or gay, and whether you were a man or woman or neither or both never even came up, even in the most progressive political program. And of course,  when art conflicts with the mainstream view, it struggles and usually dies.   Take Fran Ross's Oreo,a  satirical novel about a half-Jewish half-black girl's search for her father. Published 41 years ago, it sank on arrival,  but this month New Directions Publishing is issuing a new edition, reckoning Oreo’s time has come. WNYC's Mythili Rao explores why it’s taken so long.