ALEXANDRIA, Va. - Prosecutors acknowledge their only hope of salvaging the death-penalty case against confessed terrorist Zacarias Moussaoui is to reverse a judge's ruling barring key witnesses from testifying. But the government's avenues of appeal may be limited. Assistant U.S. Attorney Rob Spencer told U.S. District Judge Leonie Brinkema it would be a waste of time for the government to proceed if her ruling, which tossed out half of the government's case, is allowed to stand. "We don't know whether it is worth us proceeding at all, candidly, under the ruling you made today," Spencer said in an unusually blunt...