The widening gap between America’s haves and have-nots is usually expressed with hard data on the declining wages and incomes of working adults. Sociologist Robert Putnam takes a different approach — using personal stories to show how poor children lose the opportunity to achieve the American Dream. Family and community life that used to help poor kids prepare for the future are on the decline. Is the Internet making things better or worse? Is inequality becoming an issue in next year’s presidential campaign — for both political parties?