According to the Associated Press, Hillary Clinton is proposing a $10 billion to provide voluntary pre-kindergarten. ""I want every 4-year-old regardless of parental income to have access to high quality pre-K because it not only enhances their academic preparation, they stay in school longer, they have fewer behavioral problems," she says. "There is a lot of evidence that this saves money over the long run and economists and others have validated what experts in early childhood education have told us for a long time." I think the "experts" Mrs. Clinton is alluding to must be her pals at the National...