On November 4, 2008, when Barack Hussein Obama stood before 240,000 people in Chicago's Grant Park and declared "change has come to America," he wasn't just celebrating an electoral victory—he was embodying the impossible dream that a biracial kid raised by a single mother and his grandparents in Hawaii, who'd once been known as "Barry," could become the 44th President of the United States and the first African American to hold that office in the nation's 232-year history. Obama's journey defied