A number of prominent conservatives seem convinced that Martin Luther King, Jr., would have fought marriage equality. They are probably wrong. In their fight against the Supreme Court’s same-sex marriage decision, leading conservatives have been turning to an unlikely source for inspiration: Martin Luther King’s “Letter from Birmingham Jail” (PDF), the collection of notes that King smuggled out of his jail cell during his eight-day detention for protesting the Jim Crow laws that sanctioned discrimination across the South. The letter is one of the most iconic documents from of the Civil Rights era and includes King’s observations on the injustice...