Book excerpt: Whether you're a casual fan tuning in to the Kentucky Derby or a dedicated horseplayer trying to turn a profit, says the author, racing and betting today are completely different than they were in the days of Seabiscuit and Secretariat. The author has been at the forefront of many of these changes and in this long-awaited memoir, he chronicles his unique adventures in racing journalism, politics, high finance and, closest to his heart, betting on horses.