The ruling NDA in Bihar on Saturday swept the bypolls to four assembly segments, retaining Imamganj and wresting from the INDIA bloc Tarari, Ramgarh and Belaganj, receiving a boost ahead of the assembly elections due next year. Candidates of the Jan Suraaj, floated recently by former political strategist Prashant Kishor with much fanfare, lost deposits in all but one seat, in a clear indication that the fledgling party, despite claims of taking the political landscape in the state by storm, needs to cover much ground. The biggest setback for the INDIA bloc, helmed by the RJD, came in Belaganj, a seat the party had been winning since its inception in the 1990s, but this time lost to the JD(U) headed by Chief Minister Nitish Kumar, the arch-rival of its founding president Lalu Prasad. The JD(U) candidate Manorama Devi, a former MLC, defeated by a margin of more than 21,000 votes RJD's Vishwanath Kumar Singh who made his debut from a seat that fell vacant upon election to Lok Sabha of