One in five children under age 18, or 21.3%, are living in poverty in the United States, according to the latest data from the U.S. Census Bureau. In 2012, there were 15,437,000 children under 18 years old, or 21.3%, who were classified in the “below poverty” threshold, according to the Census. “The incidence of poverty rates varies widely across the population according to age, education, labor force attachment, family living arrangements, and area of residence, among other factors. Under the official poverty definition, an average family of four was considered poor in 2012 if its pre-tax cash income for the...