(CNN) -- Sen. Hillary Clinton said she "misspoke" last week when she gave a dramatic description of her arrival in Bosnia 12 years ago, recounting a landing under sniper fire. Clinton was responding to a question Monday from the Philadelphia Daily News' editorial board about video footage of the event that contradicted her assertion that her group "ran with our heads down" from the plane to avoid sniper fire at the Tuzla Air Base. Tommy Vietor, a spokesman for rival Sen. Barack Obama's campaign, said the Bosnia claim was part of "a growing list of instances in which Sen. Clinton...