LAS VEGAS (AP) — As bans against gay marriage crumble and public opinion on the issue shifts rapidly, some Republicans are pushing the party to drop its opposition to same-sex unions, part of a broader campaign to get the GOP to appeal to younger voters by de-emphasizing social issues. A gay-rights group last week launched a $1 million campaign to get the national party to remove from its platform a definition of marriage as between a man and a woman, while a group of major Republican donors is pushing for the GOP to become more supportive of gay rights across the board. "There are people with sincerely held beliefs on both sides of the marriage issue, and that seems to be where the party is heading," said Jeff Cook-McCormac, an adviser to the American Unity Fund, which has been financed by wealthy donors such as hedge-fund billionaire Paul Singer to push the GOP to back gay rights. "Younger people believe they're getting screwed by the Democrats on fiscal issues, and screwed by Republicans on social issues," said Nick Phillips, the Clark County party's political director. The state's Republican governor, Brian Sandoval, supports abortion rights, recently decided to drop the state's defense of a lawsuit challenging its gay-marriage ban, and is so popular that no significant Democrat is challenging him for re-election this year. Oregon Republican activists at an annual conference last month endorsed a ballot measure to legalize gay marriage in that state, though social conservatives boycotted the event. In Broward County, Fla., a Republican party secretary who tried to rally support for pro-gay-marriage Republicans last summer faced fierce internal backlash and has since left the post.