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President Barack Obama vowed on Wednesday to bring to justice the killers of the U.S. ambassador and three other diplomats in Libya as he sought to avoid election-year fallout from an attack that cast a spotlight on his administration's handling of "Arab Spring" unrest. Standing in the White House Rose Garden, Obama condemned the attack in Benghazi as "outrageous and shocking" but insisted it would not harm relations with Libya's new elected government, which took power in July after rebel forces backed by NATO air power overthrew Muammar Gaddafi Last year. The targeting of American diplomats - in militant violence sparked by a U.S.-made anti-Islamic film - quickly reverberated in the U.S. presidential campaign and could have implications for public attitudes toward revolutions across the Arab world. In an unusually harsh exchange so soon after a national tragedy, Republican candidate Mitt Romney slam...