Remember when a crusading president, acting on dubious intelligence, insufficient information, and exaggerated fears, took the nation into a Middle Eastern war of choice? That was George W. Bush in 2003, invading Iraq. But it's also Barack Obama in 2011, attacking Libya. For weeks, President Obama had been wary of military action. What obviously changed his mind was the fear that Moammar Gadhafi was bent on mass slaughter—which stemmed from Gadhafi's March 17 speech vowing "no mercy" for his enemies. In his March 26 radio address, Obama said the United States acted because Gadhafi threatened "a bloodbath." Two days later,...