Republicans have spent hours this week trying to portray Judge Ketanji Brown Jackson as an extremist on issues of race and an apologist for child sexual abusers. Late Tuesday, Senator Marsha Blackburn, Republican of Tennessee, added another social issue to the list of cultural grievances the G.O.P. is foisting upon her in her confirmation hearings: gender — specifically, what makes a woman a woman. Transgender rights are dominating outrage on the right, after the Republican governors of Indiana and Utah vetoed bans on the participation of transgender women in women’s sports in recent days and a transgender swimmer, Lia Thomas,...