Grassroots Democrats weighing in on several popular liberal web sites Thursday morning said that they were troubled by reports that al Qaeda's top operational terrorist, Abu Musab al Zarqawi, had been killed in a U.S. air strike. Reacting to the news, one visitor to the Daily Kos complained that using military force to kill Zarqawi "violates everything my America stands for." "It violates the rule of law and invokes the rule of force in what should be a criminal, not a military, matter." Another Daily Kos'er was irked because he thought the news would benefit President Bush: "No doubt Karl...