"Had the Grand Alliance - comprising JD(U), RJD and Congress - not been formed, Nitish would not have been able to retain power. Yet, he did not bat an eyelid before insulting the public mandate," Yadav said at a function here.
The former JD(U) president has been opposed to Kumar reuniting with the BJP, which had been the party's ally for close to two decades until the Bihar CM snapped the ties in 2013 following differences over making Narendra Modi the Prime Ministerial candidate.
However, Yadav has since been isolated within the party with the Election Commission rejecting his claim over the JD(U)'s symbol and the faction headed by Kumar pressing for his disqualification from the Rajya Sabha.
Addressing a meeting of extremely backward classes people, he said "Dalits should have been in the social mainstream. They are the people who built the monuments that are the country's proud heritage. Artisans and craftsmen have come mostly from the backward classes."