Nate Silver does a regression on states voting on gay marriage and concludes that, if a gay marriage ban in Iowa makes it to the ballot in 2012, the vote will probably be extremely close. I'm not sure if having same-sex marriage performed in the state for 3 years will help or hurt the cause. (it seems to have helped in Massachusetts?) Using the same model, he predicts Texas would vote down a ban on gay marriage in 2018, which is sooner than I would have thought.
Also up this week - the governor of Vermont is expected to veto the same-sex marriage bill today (after the Senate approves the House version), then override votes should be tomorrow.
 - See this article for a broader picture. (return)