Predicting the spread of equality

I am fascinated by this map from the Map Scroll, created using Nate Silver's regression analysis data to predict when each state is likely to legalize gay marriage. Actually, what Silver looked at was how likely each state was to vote down a ban on gay marriage, but presumably if a state does that, legalization is not too far behind.

Georgia, not surprisingly, is projected to be in the second to last group of states to embrace equality.