Published: August 20, 2010
Support for Same-Sex Marriage
* In all of the time periods shown here, a statistical technique has been used to generate state estimates from national polls. Public opinion is estimated in small demographic categories within each state, and then these are averaged using census information to get state-level summaries. Estimates in 2010 are projected from 2008 state-level estimates using an aggregate national estimate of 45 percent (or 50 percent) support for gay marriage.
Source: Andrew Gelman, Jeffrey Lax and Justin Phillips, Columbia University
This is an interactive map from the New York Times, that shows how the percentage of states has changed their opinion about same-sex marriage from 1994 to 2010. The map is interactive but the action didn't come across when I copied the map. When you hit the play button the percentage of states that approve of same-sex marriage changes until you get to 2010 when the percentage is at 50 percent. The time for which the graphic was made. There is a line chart at the bottom that is color-coded to show the percentage of individuals in each state which favor same-sex marriage.