WASHINGTON (AP) - President Barack Obama plans to address the nation's largest gay rights group this weekend, a person familiar with his schedule said Monday, trying to mollify an uneasy Democratic constituency. Obama plans to address Saturday's Human Rights Campaign fundraising dinner gala, said the person, an individual familiar with the president's plans. This person spoke on the condition of anonymity because the White House had not yet announced Obama's plans. The dinner falls on the eve of the National Equality March, expected to draw thousands of gay and lesbian activists to the National Mall.