'A conversation to be had' on war and law: Obama's Nobel speech

Even more than in the Cairo address, the Nobel speech will mark the Obama legacy. The subject is pithy, combining defense, foreign affairs and international law on the most difficult subject that human kind has ever addressed: war. Thanks to the entreaty of the Nobel committee, which forced the US president to articulate his vision of best use for the most powerful military machine in the world, one is now able to measure action against words.