When the Supreme Court takes up same-sex marriage next week, much of the debate will revolve around children. Opponents have long argued that kids' best interests require both a mom and a dad. Recently, however, more children of same-sex couples have started speaking out for themselves. Two years ago, a video of a young man testifying in the Iowa Legislature went viral. "Good evening, Mr. Chairman," the young man said. "My name is Zach Wahls. I'm a sixth-generation Iowan and an engineering student at the University of Iowa, and I was raised by two women."