Unless something changes here quickly, I think Obama will take the NATO OK, and hit with a few missiles. Sort of Clinton like and the aspirin or baby formula factory.
Then he will say Assad learned his lesson.
Then the US will be further diminished internationally.
JFK actually learned from the Bay of Pigs. While a debacle, he owned it. When the Missile Crisis came, he knew he was being pushed to the wall, because of previous failure. He coupled strength with finesse and paved a way for future talks. Will Obama finesse? Not looking like.