"It was the biggest mistake. And there is no doubt that breaking away from Congress has resulted in our heavy defeat," Lalu Prasad told reporters here.
"People have rejected our alliance with Ram Vilas Paswan (of Lok Janshakti Party). We were not expecting this result. We will now assess why we lost in Bihar and what went wrong. The Congress party has won the mandate and we congratulate them."
"We are also happy that the (Bharatiya Janata Party-led National Democratic Alliance) NDA could not win the elections," he said.
On his future, Lalu Prasad said: "Ram Vilas Paswan and I will go to Delhi Sunday and will decide then."
The RJD chief did not rule out going back to the Congress.
Published 16 May 2009, 12:33 IST