By Nate Silver
“A poll from CNN this week is the latest to show a majority of Americans in favor of same-sex marriage, with 51 percent saying that marriages between gay and lesbian couples “should be recognized by the law as valid” and 47 percent opposed.
This is the fourth credible poll in the past eight months to show an outright majority of Americans in favor of gay marriage. That represents quite a lot of progress for supporters of same-sex marriage. Prior to last year, there had been just one survey — a Washington Post poll conducted in April 2009 — to show support for gay marriage as the plurality position, and none had shown it with a majority.
As we noted last August, support for gay marriage seems to have been increasing at an accelerated pace over the past couple of years. Below is an update to the graph from last year’s article, which charts the trend from all available public polls on same-sex marriage going back to 1988.”