"In response to Blackmun's explicit request for reactions, both Thurgood Marshall and William Brennan quickly endorsed the shift to viability first suggested by Powell. After reviewing Hammond's note, Powell too prepared a letter to Blackmun, saying that "once we take the major step of affirming a woman's constitutional right, it seems to me that viability is a more logical and defensible time for identifying the point at which the state's overriding right to protect potential life becomes evident." Powell noted how "the women who most need the benefit of liberalized abortion laws are likely to be young, inexperienced, unsure, frightened and perhaps unmarried," and observed that "if there is a constitutional right to an abortion, there is much to be said for making it effective where and when it may well be needed most." Powell closed by again mentioning that he was "favorably impressed" with how Jon Newman had "identified viability as the critical time from the viewpoint of the state." Powell left his letter to Blackmun unsent, perhaps in the belief that Marshall's and Brennan's expressions of support had already made the point, or perhaps because he reiterated his views face-to-face. In any event, on December 15 Harry Blackmun notified all of his colleagues that he would be revising his Roe and Doe opinions in the manner recommended, and six days later, new all-but-final drafts were distributed as well. History has correctly recorded Harry Blackmun as the hardworking author of Roe v. Wade, but until now neither the crucial influence of Lewis Powell--nor that of Larry Hammond and Jon Newman has--been fully appreciated."