On this date in history: In 1832, the first Democratic Party national convention convened in Baltimore. In 1856, Lawrence, Kan., was burned by pro-slavery forces. In 1881, Clara Barton founded the American Red Cross. In 1924, Nathan Leopold and Richard Loeb kidnapped and killed Bobby Franks, 13, of Chicago, in a "thrill killing" that was often called "the crime of the century." They were given life sentences. Loeb was killed in prison; Leopold was paroled after serving 33 years. In 1927,