As for Bush and Iraq, the only reason Obama has the luxury of involving the US in only airstrikes while he relies on the Iraq army for boots on the ground is because Bush undertook the Iraq war and established an American footprint in the region. That, in spite of all the nonsense about WMD's and the rest, was the real mission of the war, and although Obama almost followed in the footsteps of previous 'rats who threw away victory in Vietnam by prematurely withdrawing all forces from Iraq, we may still be able to save things there with advisers, intel, and supportive air cover - nobody's forgetting, Bernie......
All the Iraq war showed the world is that we wouldn’t fight a prolonged conflict (and I guess that we learned to flee at night to avoid those photos of helicopters on the embassy roof). The Iraq war in hindsight seemed to have one purpose in mind - to destabilize the Middle East.
After all, it accomplished nothing else.