‘I’m Gay and I Oppose Same-Sex Marriage” is the title of an article Doug Mainwaring wrote earlier this year. A tea-party activist in Maryland, he found out the hard way — through the eyes of his kids — that children really do flourish with both a mother and a father active in their daily lives. “To be fully formed, children need to be free to generously receive from and express affection to parents of both genders. Genderless marriages deny this fullness,” he wrote. Mainwaring talks with National Review Online’s Kathryn Jean Lopez about last week’s Supreme Court decisions and the...