KQEH PBS NewsHour October 4, 2012
important swing state of iowa where the polls opened last week. >> a recent des moines register poll found less than 2% of iowa voters were undecided, which means the campaigns could benefit from locking in votes early. >> ifill: margaret warner examines a genetic breakthrough that could allow doctors to diagnose and treat seriously ill infants sooner. >> woodruff: and we close by returning to a conversation with tonight's debate moderator, our own jim lehrer about his book on past presidential debates. that's all ahead on tonight's newshour. major funding for the pbs newshour has be...