Here we go. The Supreme Court will hear historic oral arguments on marriage equality Tuesday. In the first of two days, gay-marriage activists will argue that the Constitution protects the right to same-sex marriage and that states cannot reject this. Proposition 8 will come to the forefront of the arguments, as the judges will consider whether the California ruling defining marriage between a man and woman is valid. The judges may rule that the Constitution says nothing on gay marriage—or that California had every right to define a traditional marriage. Wednesday, the court will hear arguments for the Defense of Marriage Act.