Now is the time for President Obama to complete his evolution on the subject of same-sex marriage. Supporting the right of all Americans to marry the person of their choice would be the right thing to do. Strange as this may sound, it also might be good politics. More to the point, it would not be the almost certainly disastrous political move of even the last presidential campaign, when none of the major Democratic candidates supported the right to marry. Flash forward three years to Hillary Clinton’s remarks. “Gay rights are human rights, and human rights are gay rights,” declared Obama’s chief primary rival and now his secretary of state, echoing her famous declaration, as first lady, about women’s rights.