Free preschool for needy kids. Studies show that kids enter kindergarten unprepared and fall further and further behind as they advance through school. 

These are the kids that windup in jail unemployed on welfare teenage mothers and in general a burden to our social net. Free preschool for these kids will mean that we won't have to pay extra social cost and we'll benefit from the work and productivity of these kids who are now prepared to engage in life. Free preschool pays for itself.