"The Course" includes possible corrections depending on information from the ground. Information from the ground has changed.
Those are tactical decisions made by military brass everyday. I think we all know that.
What is clear is that "stay the course" and "cut and run" were failing as campaign slogans. They have no real meaning in military terms.
What has changed is that people are recognizing that there is no current effective strategy for dealing with the overall sectarian civil war in Iraq. When Condi Rice recently visited the Iraqi leader, she had to circle the Baghdad airport for quite a while for security fears. Then she couldn't use the highway into the green zone because of real fears that she might be killed in a roadside attack. After flying her in on a helicopter, she finally met with the Iraqi leader. Yet, they had to meet in the dark because power had been cut to a large portion of the green zone.
What does that mean? There is little control in Iraq. It isn't even up to Afghanistan standards where we at least control a few urban centers. This is a military problem that is inexorably tied to the political sphere.
For the Republicans it is a political problem. Hence why there's no more reference to those two idiotic slogans. That's why good leaders don't say things like "bring them on" unless they are talking about situations where they know they will win. For Bush it is a legacy problem, and despite the early years where we were told that Bush has no interest in his legacy - all indication is that he is very much interested in how history will view him. Well, he's made it easy. He's Lyndon Johnson, only without the civil rights record, though with the record spending levels and a hell of a welfare program on prescription drugs. Ultimately the Iraq War will be his legacy and in all likelihood will prove Bush to be a terrible president and one that may cost the Republican Party dearly.