Coverage of the oral arguments, with this quote of the day (from one of the attorneys):

Justices also asked whether the concept of equality evolves, and, if so, why this is the time to allow same sex marriage. The concept of equality does evolve, Stewart said, “but just because society doesn’t see something as unequal until a given time, that doesn’t mean it wasn’t always unequal or unjust. It just means we were blind to it.”