In 2003, Ruth Bader Ginsberg described William Rehnquist’s feminist turn as “such a delightful surprise.” Maybe he suddenly decided that combating pervasive gender discrimination trumped states’ rights, or maybe his daughter had just become a single mom. The second explanation would comport with a new study out of the University of Rochester, which found that “judges with daughters consistently vote in a more feminist fashion on gender issues than judges who have only sons.” The effect is especially pronounced among Republican appointments.