Democratic presidential candidate Barack Obama came under fire Tuesday for saying that U.S. troops in Afghanistan are "just air-raiding villages and killing civilians." The junior senator from Illinois made the comment Monday at a campaign stop in Nashua, New Hampshire. "We've got to get the job done there," he said of Afghanistan. "And that requires us to have enough troops so that we're not just air-raiding villages and killing civilians, which is causing enormous pressure over there." The comment drew a rebuke Tuesday from the campaign of Republican presidential candidate Mitt Romney. "That is a very troubling remark on so...