A reason these urban schools have failed is because they have been run by liberal Democrats for generations. This is what must be stressed. The goal should not be to put every poor child in a private school, but for Republicans to take control of school districts in urban areas and to improve them.
If poor children go to private schools and these 65% keep voting Democrat, we would have gained very little. If these polls are accurate, that means Republicans have got the attention of 65% of a group that rarely votes for them. We should make sure vouchers are not the main issue, but rather quality education.
The GOP lead the charge in the civil war and in the civil rights acts of 1964 and 1965. This will be no different, and the Dems will claim credit after the fact.