W. BRADFORD WILCOX
Earlier this month, Bristol Palin turned herself into a poster child for the nation's continuing effort to prevent teenage pregnancies. She made the rounds on the morning TV show circuit and spoke at town hall meetings to drive home the point that other teens shouldn't make the same mistake she did. Ms. Palin's campaign could not have come at a better time. According to a recent report from the Centers for Disease Control, the U.S. -- after witnessing a 14-year decline in teenage childbearing from 1991 to 2005 -- saw the number rise from 2005 to 2007. In 2007, the latest year for which data are available, about 450,000 adolescents gave birth.