The two crucial parts of his announcement just now:
1) No rush about doing whatever needs to be done with Syria. This is a punitive rather than a preventive action, which should be undertaken with deliberation and — if and when it happens — by surprise.
2) Recognizing the higher wisdom — for himself, for the country, for the world — of taking this to the Congress.
This is the kind of deliberation, and deliberateness, plus finding ways to get out of a (self-created) corner, that has characterized the best of his decisions. It is a very welcome change, and surprise, from what leaks had implied over the past two weeks.