Sacramento - -- Gov. Arnold Schwarzenegger, whose budget already makes dramatic cuts in education, is proposing to withhold billions of dollars from schools that were guaranteed by a measure approved by voters two decades ago. School officials and education advocates railed Tuesday against Schwarzenegger's proposal, which would go into effect after 2010, arguing that it would make permanent reductions in school spending that would eliminate programs and increase the size of classes. "The vast majority of the education community in California believe that we're underfunded already," said Nancy Waymack, a policy director for San Francisco's public schools. "So when the...