The president decided he would seek congressional authorization for striking at Syria. Great. He should.
For him, politically, it's good for him, too. If congress says, "no," he can both avoid going into an unpopular war and blame Republicans for getting in the way of his doing anything. All the stupidity he's demonstrated in dealing with the Middle East he can then foist off as the responsibility of a do-nothing GOP congress. Won't matter if the Senate votes not to authorize force, or even if as many Democrats as Republicans vote against authorization. Facts are nothing; visuals are everything. And if congress does authorize it, and it is as unpopular as it seems, he can again blame Republicans.
Still, we have no interest at stake in Syria. Our vital interests lie in protecting Syria's neighbors from whoever wins that uncivil war. Our interest lies in weakening islamo-fascist groups like Hezbollah, al-Qaeda, the Muslim Brotherhood, and so on. And our interest lies in having them vent their fury on each other instead of us. Nothing President Obama has said or done in the last 3 years makes much progress in advancing any of those interests, and neither will his proposed course of action in Syria.