For the first time in history, one of the two major parties — the Democrats, of course — is endorsing full marriage equality in its platform. And the vote of the platform committee was unanimous. That’s a major step forward, spurred by President Obama’s endorsement of this idea a few months ago. This is why I said at the time that, while Obama’s endorsement was clearly politically calculated, the motives didn’t matter much; regardless of why he did it, the fact that he did it was one more step toward equality. And this is another. MLK’s arc of history continues to bend toward justice, however slowly it may seem to do so in real time.