I think it was that RvW was "settled law", or something like that.
Roberts was asked to locate the right to privacy in the Constitution. He quoted parts of the Bill of Rights pertaining to military occupations and invasions of citizens' homes. Does the right to privacy extend beyond those contexts? Roberts offered one addition: "I agree with the Griswold court's conclusion that marital privacy extends to contraception." Sen. Dianne Feinstein, D-Calif., pressed him about the extension of contraceptive rights to unmarried people. "I don't have any quarrel with that conclusion," he allowed. What about Lawrence v. Texas, the 2003 case that interpreted Griswold to bar prosecution of private sex between consenting adults? Roberts ducked the question, citing "the difference between the issue that was presented in Griswold and its ramifications." In other words, any claim of privacy beyond the specific "issue" in Griswold—the right to marital contraception—is a "ramification" Roberts might reconsider.