Soob is writing about a viral attempt by Iraq war supporters to declare victory in lieu of an official declaration. The "Victory in Iraq" campaign has gone massively viral, although it is of yet unnoticed by the MSM and much of the population.
Victory and defeat are incredibly subjective things. There are few clear-cut instances of the victor's supremacy and the loser's annihilation in history (such as WWII), but those instances are always the ones remembered in the public memory. Messy stalemates like the War of 1812 and Korea are more the case. In irregular warfare, perceptions of victory and defeat often are crucial elements of the war itself. If a population believes that there is no point in resisting, it will not resist. Likewise, if the counterinsurgent's population believes the war is lost, the implicit ceiling on the level and duration of the counterinsurgent's operations is lowered.
Because irregular warfare is not measured by typical military metrics, it is inherently more subjective than even the messiest conventional conflict. This lends itself to a purely idealistic as opposed to materialistic interpretation of victory and defeat; will is the most important factor. Losses in irregular conflicts are often seen by elements within the losing side as the fault of "enemies within"--if the domestic population hadn't stabbed the troops in the back, victory would have been in sight. Algeria is the classic example of the "stab in the back" mythos applied to irregular conflicts in that loss actually triggered a terrorist campaign against the French homeland.
As such, there is a battle of perception between different political factions within both sides to define what victory is (and deny it to their adversaries). Complicating this is the perception war that occurs long after the war is finished, as it becomes a signifier for other elements of culture or political warfare in the public mind. Vietnam is a signifier in the American life for the generational conflict of the 1960s and the culture war between left-liberals and conservatives. Certain images (such as that of the hippie spitting on the returning soldier), regardless of their accuracy or representation, embed themselves in the public mind and forever define an era.
Victory is not entirely subjective, but it in many cases it will be impossible to come up with an purely objective assessment.