If married couples are an index of economic wellbeing--and I would argue that they are--then the index is trending down. According to 2010 census results, married couples head only 48 percent of the nation's households, down from 52 percent in 2000. The percentage of households headed by married couples with children under age 18 fell to 20 percent in 2010, down from 24 percent in 2000.

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