the thing people are forgetting is that not every voucher program is necessarily a subsidy to private schools. they could just as easily be to other public school districts or charter schools or some other alternative scheme. as i said the implementation and specifics of the program matters. although i'd be open to just banning private schools entirely. actually morrakiu made a brilliant video on this awhile back. can't say i'm as rabidly anti teachers union but its still pretty amusing and makes what should (but aren't) obvious points
http://www.youtube.com/watch?v=9jK3fFu0PWc