As Americans say this may be a good cop/ bad cop situation, Olmert has to say what he thinks Americans want to hear but Barak can speak from a position of non-appeasement, making it hard for useless concessions to be forced on Israel. If not this shows Barak is surely running for PM, and will compete with Netanyahu's positions. It is a brilliant move lumping Olmert, Ramon, and Livni into a position of being weak/out for their own interests/against the security of the state. Livni will have no chance to ever be PM having become so tainted by her role in Olmert's government.
Knesset passes 'Norwegian Law' allowing ministers to resign their seats, remain in cabinet (Haaretz)
from the article: Barak: Israel shouldn't appease U.S. president with one year left