NEW YORK (AP) — A new poll shows that the partisan gap over same-sex marriage continues to widen, with 65 percent of Democrats now supporting it compared to 24 percent of Republicans.

The Pew Research Center poll found an increase in support among Democrats after President Barack Obama's announcement in May that he favored same-sex marriage. A poll taken in April found 59 percent of Democrats in support.

The latest poll was released a day after Democratic Party leaders said they intended to add support for gay marriage to the party platform at the Democratic National Convention in early September.