Trayvon Martin, the Florida teenager shot dead during a scuffle with a neighborhood watchman, was suspended from his Miami school three times over the past year, according to the family attorney. The revelation that Martin, 17, was dogged by disciplinary problems at school was the latest salvo in a war of leaks meant to bolster each side amid rising tension over the Feb. 26 shooting. Martin's parents, Sybrina Fulton and Tracy Martin, will appear before a House panel today and rallies continue around the country demanding that George Zimmerman, the 28-year-old watchman who shot Martin, be arrested. Martin may have...