Brookings senior fellow Grover Whitehurst has just come to the defense of education secretary Arne Duncan over charges that Duncan sat on (or remained "willfully ignorant" of) a study showing that the D.C. voucher program is boosting achievement. The Senate passed a bill sunsetting funding for the program on March 10, but Whitehurst contends Duncan wouldn't have known about the study's results until a week or so later (it was released on April 6th).

Until last November, Whitehurst was head of the Institute for Education Sciences (IES), which released the new voucher study. He obviously knows its timelines and procedures. But even Whitehurst acknowledges that there is "substantial reason to believe that the secretary didn’t want to draw attention to the report," citing the choice of a Friday release (Friday releases were deliberately discontinued by the IES years ago) and the mysterious absence of the news briefing that typically accompanies the release of such reports.

So what is a fair observer to think of Secretary Duncan based on Whitehursts' revelations? Duncan may not have had an opportunity to sit on the report, because he may not have known about it. But Duncan had ultimate control over its release and it looks as though he went out of his way to bury it.

Why would a secretary of education bury a study showing that one government program (vouchers) produces better outcomes than another government program (D.C. public schooling) at one quarter the cost? No flattering explanation comes to mind. Perhaps someone else will come forward to defend Duncan on this point.

Or perhaps the secretary himself might like to share with the American people why this study was buried at the bottom of a locked filing cabinet in the basement of an abandoned building with a hand scrawled "beware of leopard" sign affixed to it. Maybe he would like to let us know why he isn't touting private school choice as a model for the states to emulate at a time when outcomes are languishing and money is tight. The only justification he has offered for not doing so is risible: it doesn't serve enough kids. As Cato's David Boaz pointed out earlier today, it is only limited in size because, uh..., Congress statutorily limited its size. We know that many more parents would like vouchers. We know from the international evidence that the supply of schools rises to meet demand, just as supply rises to meet demand in other fields.

But we also know that the Democratic party is beholden to the teachers unions and that the National Education Association sent a letter to congressional Democrats — not to all of Congress, mind you, it's addressed "to Democrats" — demanding that they kill the D.C. voucher program.

Because of the constant pressure exerted by the NEA, Democrats who might otherwise have supported the program have voted to let it — and the hopes of 1,700 poor kids — die. To reverse their decision, a countervailing public pressure must be brought to save it.

And that is why Grover Whitehurst is mistaken when he says that "the future of the D.C. Opportunity Scholarship Program is far more important than the contretemps" over the secretary's handling of the voucher study. The future of the program depends on that "contretemps." Were it not for the public outcry, there would be no political pressure on Democrats to rethink their decision to feed these children back into the D.C. public schools.

And as someone who is much happier under divided government than under the unitary rule of either major party, I hope that Democrats figure out that long-term political calculus demands support for educational freedom. When the $100 billion "stimulus" spending on public schools accomplishes little or nothing — as it will — the public will be even angrier at the politicians extorting them into those schools. And the party associated with defending that system to the bitter end against the wishes of families won't recover for a long while.