Yesterday marked a return engagement. Since Sept. 11, Bush said, "I have seen the faces of children who were directly affected by the attacks," which had made her, she said, "doubly committed to using my voice to help give our youngest Americans a real chance to succeed in the classroom." [...] Bush's relaxed performance yesterday was in striking contrast to the spectacle created in 1993 by Clinton when she testified to five congressional committees in three days about a White House health...