What's the rush?

So James Fallows asked the president. Why strike Syria  isolated from almost all sources of potential support, domestic as well as foreign? Why not make the case with more deliberation and build more support, foreign and domestic? Surprise! Obama, who boasted of doing just that in Libya, now appears to be on the same page.

At the risk of pointing out the obvious: his statement this afternoon announcing that he would seek Congressional authorization for a strike was pitched to an international audience as well. He's seeking more than Congressional support. My italics:

Here’s my question for every member of Congress and every member of the global community: What message will we send if a dictator can gas hundreds of children to death in plain sight and pay no price?

What’s the purpose of the international system that we’ve built if a prohibition on the use of chemical weapons that has been agreed to by the governments of 98 percent of the world’s people and approved overwhelmingly by the Congress of the United States is not enforced?