This style has never been more evident than in his decision to expand the war in Afghanistan. America traditionally fights its wars in a spirit of moral fervor. Most war presidents cast themselves as heroes on a white charger, believing that no one heeds an uncertain trumpet.

Obama, on the other hand, cloaked himself in what you might call Niebuhrian modesty. His decision to expand the war is the most morally consequential one of his presidency so far, yet as the moral stakes rose, Obama’s emotional temperature cooled to just above freezing. He spoke Tuesday night in the manner of an unwilling volunteer, balancing the arguments within his administration by leading the country deeper in while pointing the way out.

Despite the ambivalence, he did act. This is not mishmash. With his two surges, Obama will more than double the number of American troops in Afghanistan. As Andrew Ferguson of The Weekly Standard pointed out, he is the first Democratic president in 40 years to deploy a significant number of troops into a war zone.

Those new troops are not themselves a strategy; they are enablers of an evolving strategy. Over the next year, there will be disasters, errors and surprises  as in all wars. But the generals will have more resources with which to cope and respond.

If the generals continue to find that stationing troops in the villages of Helmand Province leads to the revival of Afghan society, they will have the troops to do more of that. If they continue to find that order can be maintained only if social development accompanies military action, they will have more troops for that. We have no way of knowing now how those troops will end up being used. And we have no clue if it will be wise to withdraw them in July 2011.

The advantage of the Obama governing style is that his argument-based organization is a learning organization. Amid the torrent of memos and evidence and dispute, the Obama administration is able to adjust and respond more quickly than, say, the Bush administration ever did.

The disadvantage is the tendency to bureaucratize the war. Armed conflict is about morale, motivation, honor, fear and breaking the enemy’s will. The danger is that Obama’s analytic mode will neglect the intangibles that are the essence of the fight. It will fail to inspire and comfort. Soldiers and Marines don’t have the luxury of adopting President Obama’s calibrated stance since they are being asked to potentially sacrifice everything.

Barring a scientific breakthrough, we can’t merge Obama’s analysis with George Bush’s passion. But we should still be glad that he is governing the way he is. I loved covering the Obama campaign. But amid problems like Afghanistan and health care, it simply wouldn’t do to give gauzy speeches about the meaning of the word hope. It is in Obama’s nature to lead a government by symposium. Embrace the complexity. Learn to live with the dispassion.