Standing at the High School of the Future, he pitched himself as the Mayor of the Future. U.S. Rep. Chaka Fattah, who just 12 days ago won election to his seventh term, yesterday stamped out questions of where his political ambitions will take him next, declaring himself a 2007 candidate for mayor. "I don't know if the skeptics are listening," he told hundreds of supporters on a sunny, crisp afternoon near the city's Parkside neighborhood. "But the answer to the question that's been debated for many, many months is that, yes, I'm going to offer myself as a candidate for...