Republicans like to blame poverty on the breakdown of the “traditional” family. The numbers tell a different story. … Conservatives like to tout the research of Raj Chetty and others who find that, “The fraction of children living in single-parent households is the single strongest correlate of upward income mobility among all the variables we explored.” But this observation comes with a caveat — children in two-parent households fare worse in areas with large numbers of single parents. There is reason to believe the causation is reversed. Rather than single-parent households causing low upward mobility, low upward mobility and rampant poverty lead to single-parenthood. ….