Obama doesn't need UN, Congressional, Allied, or American Public support. Obama has AIPAC approval.
http://www.google.com/search?q=AIPAC+attacking+Syria&sourceid=ie7&rls=com.microsoft:en-us:IE-SearchBox&ie=&oe=
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Vladimir Putin, the Russian president, has demanded that the United States provide any evidence of the Syrian government's alleged use of chemical weapons against civilians to the UN Security Council.
Speaking to reporters on Saturday, Putin told journalists that the proof should be shown to UN inspectors and the Security Council, adding that it would be "utter nonsense" for the Syrian government to have used such weapons.
"Syrian government troops are on the offensive and have surrounded the opposition in several regions. In these conditions, to give a trump card to those who are calling for a military intervention is utter nonsense,"
Regarding the provision of evidence by the US, Putin said that "if they don't show it, that means there is no proof".
As tensions rise, Arab foreign ministers (SUNNIS) will meet in Egyptian capital, Cairo, on Sunday to discuss Syria, Arab League deputy chief Ahmed Ben Helli said.