Irag war: 骑虎难下, withdrawal or non-withdrawal, there is no good solution. If the next president orders a quick withdrawal, he will take a huge political risk. (Long story). Therefore neither McCain nor Obama will do that. On the other hand, this war is bleeding US to the slow death.
老萨死得比窦娥还冤. He was doing a good job in balancing power in mid-east for US. Sigh.
Since what is done has been done, the best strategy in the best national interest of US (regardless of moral standards):
US troops retreat to oil field areas and establish forbidden safety zones there; drill the heck free oil. Ket Iraqis to deal with each other.