Republican Gov. Dennis Daugaard shocked conservatives Tuesday when he vetoed legislation that would have prohibited students in South Dakota public schools from using opposite-sex restrooms, locker rooms and shower facilities. The decision is a boon for transgender advocates who lobbied the governor to reject the bill, arguing it was discriminatory and would have harmed the emotional well-being of transgender students. Proponents of the legislation contended it’s inappropriate to have adolescent boys and girls showering and changing in the same room. “Do you feel it appropriate for a 13-year-old girl to be exposed to the anatomy of a boy? Or for...