Polls show that President Obama's Libya intervention has the lowest public support of any US military action in three decades. That's not surprising, because Obama seems ambivalent about the enterprise himself. Whatever he says tonight to rationalize it, Americans are learning a sober truth. America's chief executive isn't simply one step behind events in Libya; he seems determined to miss a once-in-a-lifetime opportunity for the free world in the Mideast. From Tunisia to Iran, the region is in the midst of a democratic seismic shift as autocracies old and new, friend and foe, rock on their foundations. Like most earthquakes,...