A federal judge sentenced Francisco Martin Duran to 40 years in prison. Duran was convicted of trying to kill President Clinton when hesprayed the White House with bullets last October. Prosecutors had asked for a life sentence for Duran, who had argued that, in a fit of paranoid schizophrenia, he thought he had been chosen to shoot and kill an evil "mist" that was enveloping the White House. U.S. District Judge Charles Richey said the sentence, which includes no chance of parole, was sufficient both to punish him and to discourage others from similar attacks. Duran, sober and contrite in court today, told the judge he plans to earn a college degree in small business management while he's in prison.