Mark Sanford’s victory in Tuesday’s congressional election added another chapter in his amazing political journey. Yet even as the spotlight shined on Sanford’s failures and triumphs, the deeper story of his ambitions and missteps remained largely out of view. Inside today’s newspaper and over the next three days, excerpts from a forthcoming e-book, “Second Chance: The Mark Sanford Story,” reveal new twists in this saga. Written by two-time Pulitzer Prize finalist Tony Bartelme, and based on never-before-published emails, journals and other documents, “Second Chance” paints the most revealing portrait yet of a public figure who has shocked and captivated the nation.