Carla Tuff rode one of 12 buses that departed Los Angeles at 3 a.m. today to join an estimated 1,500 people protesting statewide HIV service cuts at the Capitol. The "Fight for Your Life" rally was organized by the San Francisco AIDS Foundation along with other HIV and AIDS awareness organizations. Tuff said she was one of 58 other protestors who rode a bus from the Tarzana Treatment Center in Los Angeles, where she has received medical and mental treatment as an HIV-positive patient for the past several years. "If they stop our medications ... I won't be able to raise my kids," Tuff said. Now 44 years old, Tuff said she was 26 and pregnant with her first child when she was diagnosed HI