Before President Obama can do anything, several requirements must be met:
The first requirement is to be a part of a full NATO and Arab League collaboration. Russia and China are vetoing any NATO resolutions concerning Syria. The Arab League is still too full of oppressive and sorry regimes who are hanging on to power like Assad's in Syria.
The second requirement is for Syrians to form an opposition that is capable of running the country if Assad is deposed. Libya had such an opposition established and in place.
The third requirement is for the Syrian opposition to request more than money and weapons. The Syrians have been adamant that they do not want outside interference, just the money and weapons. No go on that!
Until NATO, Russia, China, the Arab League and any Syrian opposition organizations get it together, our hands are tied. Even if it all came together, we would only be able to do limited involvement.