Ivo Daalder and Robert Kagan came together to write an op-ed and the results are... pretty much exactly what you'd expect from two men whose foreign policy views are so deeply at odds.
A policy of seeking consensus among the world's great democratic nations can form the basis for a new domestic consensus on the use of force. It would not exclude efforts to win Security Council authorization. Nor would it preclude using force even when some of our democratic friends disagree. But the United States will be on stronger ground to launch and sustain interventions when it makes every effort to seek and win the approval of the democratic world.
I can't honestly conceive of an odder marriage of convenience than the one between these two. It seems likely to me that what Ivo wants to say is "we need to seek consensus among the world's great democratic nations" whereas what Kagan wants to say is "the United States should do what it takes to be on strong grounds to launch and sustain interventions." But it also seems likely to me that if America's engagement with the world's democracies is premised entirely on the hope of continuing broadly interventionist military policies, then both our military and our diplomatic efforts will fail terribly.