The Boy Scouts of America's national leadership will vote Thursday whether to allow openly gay Scouts in its ranks, a critical and emotionally charged moment for one of the nation's oldest youth organizations and its millions of members. About 1,400 voting members of BSA's national council are to cast ballots Thursday on a resolution that would end a policy that allows youth Scouts to be excluded based only on sexual orientation. The ban on gay adult leaders would remain in place. The vote is taking place at a resort in Grapevine, Texas, not far from BSA's headquarters, during the national council's three-day annual meeting. While the meeting was closed to the public, it was closely watched by supporters and opponents of a change. Both sides on Wednesday made a final effort to explain their positions. Gay-rights supporters and others who want the policy changed held a summit at a nearby resort, while opponents held signs on the street next to the entrance and a rally nearby.