Gay Marriage: Tipping Point?

You'll have to embiggen this graph from FiveThirtyEight to make sense of it.

Jeff Lax and Justin Phillips put together a dataset using national opinion polls from 1994 through 2009 and analyzed several different opinion questions on gay rights. Here I'm going to talk about their estimates of state-by-state trends in support for gay marriage. In the past fifteen years, gay marriage has increased in popularity in all fifty states. No news there, but what was a surprise to me is where the largest changes have occurred. The popularity of gay marriage has increased fastest in the states where gay rights were already relatively popular in the 1990s. In 1995, support for gay marriage exceeded 30% in only six states: New York, Rhode Island, Connecticut, Massachusetts, California, and Vermont. In these states, support for gay marriage has increased by an average of almost 20 percentage points. In contrast, support has increased by less than 10 percentage points in the six states that in 1995 were most anti-gay-marriage--Utah, Oklahoma, Alabama, Mississippi, Arkansas, and Idaho.