Marion S. Barry, Jr., the sharecropper's son and civil rights activist who became Washington, D.C.'s most flamboyant and divisive mayor for four terms, died early Sunday at the age of 78. United Medical Center spokeswoman Natalie Williams said Mr. Barry arrived at the hospital around 12:30 a.m. and died at 1:46 a.m., following a brief stay at Howard University Hospital. No cause of death was given, but Barry had suffered many health problems over the years, including prostate cancer, diabetes, anemia and kidney ailments. Among Washington's poorest residents, Barry was viewed as a symbol of hope for the attention he...