Gov. Scott Walker?s budget proposal calls for deep cuts in most areas of public education with one notable exception – public school choice programs. Meanwhile, Milwaukee?s 20-year-old voucher program would receive $22.5 million more to accommodate 1,300 additional students. The growth would result from Walker?s proposal to remove the program?s income requirements and enrollment caps. And independent charter schools would receive $18.4 million more over the biennium. Walker is projecting 600 additional students as his proposal would lift the state enrollment cap on virtual charter schools, allow the UW System?s 13 four-year universities to establish charter schools, and allow independent charter schools in any district in the state.Independent charter schools are currently limited to Milwaukee and Racine counties. Education historian Diane Ravitch, a New York University professor and former assistant U.S. secretary of education who is speaking at UW-Madison on Tuesday, say choice programs have drained resources from the traditional public school system without producing conclusive evidence that they are any better at educating students, particularly low-income ones.