In 1972 , Campbell 's university began a project to track the success of a group of preschoolers and a similar control group of kids who were not given access to preschool . Barack Obama : Research proves the effectiveness of preschool . President Preschool recently said all American should have access . Sutter : Preschool could be a great equalizer for rich and poor . He says studies show its effects last into a person 's 50s and 40s .
Barack Obama : Research proves the effectiveness of preschool . President Preschool recently said all American should have access . Sutter : Preschool could be a great equalizer for rich and poor . He says studies show its effects last into a person 's 50s and 40s .