A new study shows that disparities in education, mental health, obesity, absent fathers, isolation from church, isolation from community groups -- these gaps are now as much about growing up rich or poor as they are about anything else. The gap in test scores between poor kids and wealthy kids is now nearly twice what it is between white kids and black kids. Kids with working-class parents are 10 times likelier than kids with middle- or upper-class parents to go through a time when their parents have no income. So the fact is this: The opportunity gap in America is now as much about class as it is about race, and that gap is growing.