PHILADELPHIA — Former President Bill Clinton took aim Monday at Kenneth Starr and the Republicans who pressed for his impeachment, telling a sympathetic audience in Philadelphia that he was sorry for his personal mistakes but "proud" for having stood up to his political adversaries. "I am ashamed to this day for the personal mistake I made, but I am proud I did not break under what they tried to do to me for seven years, because you would be worse off. You would be worse off," Clinton told hundreds of cheering fans during the latest stop of his book...