The voucher program in D.C. that Obama just killed was so effective that the Obama administration had to sit on the data for 6 months, going back to before the inauguration. It was just damning. The D.C. kids that went to private schools got a better education, and they got it at 25% of the cost of the failing public school district. That's not a typo - each voucher had a corresponding 75% cost savings in addition to the better education.