Joe Biden's plan for universal preschool forgets key to children's success: Parents.

Preschool attendance is voluntary. That means children with motivated, engaged parents attend preschool to begin with — parents who find a program, enroll their children and get them there every day.

Last month, the Biden campaign released a plan to implement universal preschool for all 3- and 4-year-olds to “cultivate the potential of young children” and “laying a strong foundation” for their academic success. While it may be well intentioned, the plan is based on critical errors in interpreting the research on the effects of preschool. If Joe Biden’s goal is to help America’s most vulnerable children, universal preschool is a costly mistake.