Families of U.S. troops have long adhered to a clan code that prohibits speaking out against a war. Now some are going public over Iraq.PHILADELPHIA — In Love Plaza, about 75 people mingled in bright sunshine, chatting noisily while one speaker after another droned on at a campaign rally. Vendors hawked T-shirts, and children frolicked in a fountain opposite ornate City Hall. Then Celeste Zappala stepped onstage. Standing between columns of red, white and blue balloons, she held up the Purple Heart awarded posthumously to her oldest son. The plaza fell silent. In calm, measured tones, Zappala talked about her...