By Rich Lowry
The least-plausible sentence in the English language is “We know this works,” when those words are spoken by President Barack Obama.
He said them the other week in his State of the Union address about early-childhood education. President Obama called for universal preschool funded by the federal government in cooperation with the states. He cited “study after study” showing that investment in Pre-K pays for itself several times over by creating better outcomes for children.