On 7 June 2015, Lalu Prasad Yadav announced the RJD was joining in an alliance with the JD(U) for the election.
[8][9][10] Union Minister Ram Vilas Paswan supported a comprehensive classification of caste data of SECC 2011 before its release.
[11][12][13] BJP Leader Sushil Kumar Modi called for a rectification of errors in the cases of 1.46 crore people in India, including 1.75 lakh in Bihar, before releasing the caste data.
[26][27][28] Initially there were definite political overtures when both Lalu Prasad Yadav and Nitish Kumar shared stage together in a public[29] event commemorating former chief minister Satyendra Narain Sinha's birth anniversary that witnessed veiled attacks on each other, the last time[30] they did it in public.
The drifting away of Rashtriya Lok Samata Party created uncertainties in the camp of National Democratic Alliance over shifting of the support of Koeri caste on whom RLSP was thought to have strong hold.
The political crisis was caused by Nitish Kumar feeling "insulted" by the Mahagathbandhan and the larger Indian National Developmental Inclusive Alliance.