I've argued in the past that one of the problems with No Child Left Behind is that only a few of the children in public schools would get to benefit from going to a private school with the vouchers, and the private schools get to choose whom to take, meaning that those who could potentially benefit the most from "better" educators would still be left behind. I also argued to the short-sightedness of the voucher program, that is, it only speaks to the educators, and not the environment from which the students came, their home life.
It turns out, perhaps these two issues should have been, or at the very least, need to be, addressed. This is because the School Voucher Program in Wisconsin has resulted in no change in performance on test scores. That's right. The children who got the precious vouchers, and therefore the "better" education scored no higher than Les Miserables who were left behind. I first read about this at Americans United. In other words, the program that takes millions of dollars from public schools that are "failing" students to allow a fraction of those students harmed to go to parochial/private schools results in no increased benefit for any of the students. Perhaps this money could be better used in the aggregate, rather than segregating the chosen few deemed worthy enough to deserve a chance to succeed in the eyes of the state and churches.