This article about growing dissatisfaction with the war in Iraq among the members of the House and the Senate quotes Professor Mariano-Florentino Cuellar:

Such limits, said Mariano-Florentino Cuellar, a Stanford University law professor, would force Bush "to accept that his last two years in office are basically a failure defined by the fact that he lost control of the one issue that defines presidents -- the conduct of national security and defense."