Top photograph of Big Brown galloping to victory by Al Behrman/AP; lower photograph of Big Eight Belles by Brian Bohannan/AP Big Brown fulfilled his role as the favorite, winning yesterday's 134th Kentucky Derby at Churchill Downs by four and three-quarters lengths. But the victory of Big Brown and jockey Kent Desormeaux was overshadowed by the death of the second place finisher, Eight Belles. The female horse was also favored in the race, but when......