Home schooling is not a general substitute for public schools. Many families are not economically able to keep a parent home to do so. And many parents are just not good teachers, at least from an academic viewpoint.
As far as vouchers go, the voucher programs I've seen don't cover the full costs of private schools, so there's still a economic disadvantage to them for poor people.
Or could this actually be Tarayza on a scooter?
This illustrates what will happen to the US economy if Kerry is elected
Government schools nationwide cost about $7k/student/yr. Parochial schools cost about $1.5-3k/student/yr, mainly because teachers in parochial schools earn half as much as their government school counterparts, and teacher salaries represent 85% of a typical government school budget.