As Mr Obama lamented, fourth-grade (ie, nine-year-old) readers in Mississippi can score 70 points worse than their peers in Wyoming and receive the same grade. The Fordham Institute, a think-tank, measured the same 18 primary schools by different states' benchmarks. In rigorous Massachusetts, only one passed muster. In sloppy Wisconsin, 17 did. Mr Obama promised that, later this year, he would tie federal money to results. But he did not say how.
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