A rebellious slate of candidates who this year upset the normally placid balloting for the Board of Overseers at Harvard has failed to secure positions on the board, which helps set strategy for the university. Calling itself Free Harvard, Fair Harvard, the group ran on a proposal that Harvard should be free to all undergraduates because the university earns so much money from its $37.6 billion endowment. It tied the notion to another, equally provocative question: Does Harvard shortchange Asian-Americans in admissions?