As Barack Obama settles into the White House, a cavalcade of related books has hit the shelves. Get a nuts-and-bolts, state-by-state analysis of his victory in Chuck Todd and Sheldon Gawiser's How Barack Obama Won (Vintage, $14.95 paper). Or read insights into Obama's global challenges in David E. Sanger's The Inheritance (Harmony, $32 cloth). In The Breakthrough, Washington Week editor Gwen Ifill looks at past political gains made by American blacks that set the stage for Obama. And don't forget the mother of them all, Obama's personal statement, The Audacity Of Hope, now in paper (Three Rivers, $19.95).