CHICAGO (Reuters) - The national debate over gun violence took a highly personal turn for first lady Michelle Obama when a Chicago girl was slain near Obama's family home just days after she performed at the presidential inauguration in Washington. The first lady and top federal, state and city officials joined hundreds of mourners on Saturday at the funeral of Hadiya Pendleton, 15, who was killed at a park near her Chicago high school, casting the bitter national debate over gun violence in personal terms for the Obamas. ...