A group of party leaders and workers distributed sweets at the Janata Dal-United (JD-U) and Rashtriya Janta Dal (RJD) offices, expressing their happiness over the announcement made in New Delhi.
The Congress is expected to be part of the RJD-JD-U combine.
RJD leader Ramanuj Prasad said this development would strengthen the social support base of Lalu Prasad and Nitish Kumar. "Both will consolidate their social support."
JD-U state president Vashisht Narain Singh said: "It is a big development to defeat the BJP."
Congress leader Prem Chandra Mishra called it a positive step. "The BJP and its allies are shocked as they have been trying hard to foil it."