We may have blown our wad; politically and militarily.
It's up to the American electorate to decide where we go from here.
One of the first requirements in any war is to visualize the enemy. Any neighboring area is in danger of furnishing safe haven and support for its neighbor. WW II, Korea, Vietnam, Kosovo, all had this characteristic. There is no border security confining the conflict to a specific area. Even now we see a tendency to pull out via sovereignty for Iraq and shift the remaining problems to the Iraqis themselves. This is not a good omen for the continuance of the will to follow through for a victory.