Time Is On Our Side
Stats guru Nate Silver has done his usual brilliant number crunching and made estimates on how long it will take each state to reaching the tipping point at which ballot measures to ban same-sex marriage would fail. Go to the above link for Silver's explanations of how he reached his conclusions. Below is a map/timeline made by a Silver fan, which I found on Fark. Remember, these are the years by which marriage-banning referendums are expected to fail, not the years by which marriage equality would be enacted.