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NO THEY DID NOT. As Tim3 points out we were not attacked by the Afghan government which as been the left's dividing line here for years. Even if you argue they hid OBL that doesn't pass muster as a "cassus belli".
As usual the left finds itself pursuing actions for which they loudly denounce others. Tsk. Tsk.
Just as it is wrong to blame and entire people for the attack carried out by 19 Saudi terrorists, it is wrong to blame "The Left" for supporting a war that many of us vehemently opposed.
Shooter, many on the Left (what you would call the fringe leftist lunatics) believe that we have no moral right to start wars in foreign lands; that we ought to slash the military budget and use that money to look after our own people (as in universal single-payer health care, for example). Unfortunately "The Left" hasn't had a real voice in this country's politics since the '30s.
But then, perhaps you are confusing establishment Democrats with The Left? Because, as you see with Obama, establishment Democrats are hardly your rabid left-wingers, being instead centrists who do not challenge the basic premise that we have the right to "project force" wherever required.