The other day after Tom Schelling spoke at one of our events, we stepped into the elevator together. David Hoffman, who works upstairs, was standing inside. I introduced them.

“A Nobel Prize winner and a Pulitzer Prize winner,” I said. “This is a pretty quality elevator ride.” Hoffman demurred that a Nobel is much more impressive than a Pulitzer, but he can say that. I haven’t won anything.

Today, Hoffman has a very readable piece (Obama’s Atomic Choices) on the Nuclear Posture Review on the Foreign Policy website.

He ledes with the Administration’s last minute decision not to declassify the size of the nuclear stockpile. Hoffman argues that the decision to back down offers a “clue about the president and the process that created the document”:

After a painstaking, months-long process, one of the issues still being hashed out at the end of the deliberations on Barack Obama’s new Nuclear Posture Review was whether his administration could finally go public with the precise number of nuclear warheads held by the United States.

Those arguing to disclose the total said it would set an example for the rest of the world. Obama’s report was the first in the post-Cold War era to be entirely unclassified, and the document called on China, in particular, to be more transparent about its nuclear forces and intentions. An accounting of the total number of American warheads would be a highly symbolic move.

Those arguing to keep the number secret said it was too dangerous to reveal, offering states or terrorists seeking to build their own weapons a clue to the amount of fissile material necessary for a bomb. The fear was they might be able to calculate this by comparing the warhead total with previous statements on stocks of fissile material. (Jeffrey Lewis of the New America Foundation disclosed this debate in a blog post that pointed out that the amount of plutonium needed for a weapon is already declassified.)

In the end, by the time the Nuclear Posture Review was unveiled April 6, a decision had been made to keep the warhead total under wraps. This choice offers a small clue about the president and the process that created the document, only the third such review since the end of the Cold War and described by the administration as a “foundation” of U.S. policy on nuclear weapons for years ahead.

Obama’s vision of a nuclear-free world met the reality of a commander in chief’s world; his campaign for change ran into the inertia and complexity of governing.