John Sutter : Research proves the effectiveness of preschool . President Barack Obama recently said all Americans should have access . Sutter : `` Unequivocally , yes , I think it works , '' said Frances Campbell , a senior scientist at the University of North Carolina at Chapel Hill . Preschool could be a great equalizer for rich and poor . This transcript has been automatically generated and may not be 100% accurate.
John Sutter : Research proves the effectiveness of preschool . President Barack Obama recently said all Americans should have access . Sutter : Preschool could be a great equalizer for rich and poor . This transcript has been automatically generated and may not be 100% accurate.