In Britain, Blair has seen a steady erosion of support. Three months ago roughly half of all Britons would have supported going to war without a second U.N. resolution; less than 10 percent would do so today. So far, Blair has made little headway against that tide. Over the next few weeks he will continue to argue the need to get rid of Sad-dam on humanitarian grounds, even though he got a serious rebuff last week when the spiritual leaders of Britain’s two largest Christian denominations said they doubted the moral legitimacy of the war and shared a “deep disquiet” about it.