The editorial board of the Washington Post has recommended some beach reading for President Obama:

He should start with Patrick J. Wolf’s article in the new issue of Education Next. Mr. Wolf, a professor of education reform at the University of Arkansas, is the principal investigator of the D.C. Opportunity Scholarship Program, which allows low-income children to attend private schools. He was unequivocal in his findings: “The D.C. voucher program has proven to be the most effective education policy evaluated by the federal government’s official education research arm so far.

The editorial continues, “Mr. Obama, along with Education Secretary Arne Duncan, has repeatedly promised to support “what works,” so we figure he should be interested in Mr. Wolf’s findings.”