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A fourth, "credible" poll has shown that more Americans now back gay marriage than don't, reports New York Times blogger and statistician Nate Silver.
The most recent poll from CNN found that 51 percent of U.S. adults think same-sex marriage should be legal. Support was even greater — near 60 percent — among women, Democrats and people under the age of 50.
Charting the trend of all available polls, Silver marks a 4 percentage-point jump in favor of gay marriage over the past two years. That's double the rate of long-term growth in public support.