Long before he arrived at the White House, Barack Obama was the son of a single mother, challenged and tempted by the same societal ills that disproportionately keep African-Americans impoverished and behind bars. Now the nation’s first black president is unveiling a new initiative aimed at breaking down those obstacles, and pledging to continue the fight long after his presidency ends. Joined at the White House by young men of color, Obama on Thursday was calling on America’s businesses, philanthropists and government leaders to join forces to put more boys on a path toward successful lives. Foundations were to announce...