Defense of Marriage Act: 18 senators who regret voting for it

U.S. Sen. Rob Portman became the first Senate Republican to back gay marriage Thursday.In a guest column in the Columbus Dispatch, the Ohio Republican announced that he had rethought his stance on gay marriage. As a member of the House in 1996, Portman was one of the co-sponsors of the Defense of Marriage Act, which barred federal recognition of same-sex marriage. But he's not the first person involved in that law to have second thoughts, especially as a legal case ...