House Democrats have stopped a Republican bid to force an investigation into whether Democratic leaders covered up allegations against former Congressman Eric Massa.Massa resigned from congress amid growing accusations that sexually harassed male employees.Minority leader John Boehner wanted the House ethics committee to investigate and report by June 30.Instead, the house voted 402-1 to allow the panel to determine the next step.Democratic leaders deny any cover up.The ethics committee ended its investigation on Monday after Massa resigned his seat.