After a dismal showing in Lok Sabha polls,RJD president Lalu Prasad on Saturday said not contesting elections in alliance with Congress was a "big mistake" and the people of Bihar had "rejected" the Fourth Front. "The decision to contest elections without Congress on our side was a big mistake and I acknowledge it. However,it is a matter of great happiness for me that the UPA is all set to form its government at the Centre," Prasad told reporters while reacting to the poor performance of Fourth Front. Prasad said RJD would continue to be part of UPA. "Our relations with the Congress remain as they were before the polls." "It is true that the Fourth Front comprising RJD,LJP and SP has been rejected by the people of Bihar. I humbly accept the people's verdict and vow to continue to work for the betterment of the state," he said. The RJD chief said he would review the reasons for the defeat and the leaders of the Fourth Front would meet in Delhi on Saturday to discuss their future course of action. He,however,did not agree with Chief Minister Nitish Kumar's argument that it was a positive vote for the state's NDA government's development agenda. In electoral politics,it is not always development that fetches you good results. At times the politicians sit atop the ship and at times are down in the sands," he said.