The high-stake elections not only revived the talk of "mahagathbandan", it has literally forced a split in JD (U), whose lone tribal MLA Chhotu Vasava voted for Patel going against the party whip.
Yadav - who will begin a visit to Bihar on Thursday - has been public about his unhappiness with party chief Nitish Kumar deciding to break away from the "grand alliance" with the Congress and the RJD, and allying with the BJP.
Soon after a top leader of his party, KC Tyagi, said Mr Vasava had voted for the BJP.
JD-U leaders started targeting Yadav since last week after he spoke out against Nitish Kumar's decision to embrace the Bharatiya Janata Party. Last month, in a shock move, Bihar chief minister Nitish left the "grand alliance" claiming his move was inspired by "conscience" as he couldn't possibly support RJD chief Lalu and his son who was deputy CM, Tejashwi Yadav, following their being named in a CBI corruption case. "I voted for Ahmed Patel".
After he lost to Rajesh Ranjan alias Pappu Yadav from the Madhepura Lok Sabha seat in 2014, the JD (U) had sent Yadav to the Upper House of Parliament a year ago. Tyagi openly declared that the vote was for the BJP. The JDU's general secretary in Gujarat Ambalal Jadhav too said Mr Vasava had voted for the Congress candidate. Who is Tyagi to say anything. Vaghela, whose resignation from the Congress on July 21 triggered the crisis for the party, voted for BJP even though he had told Ahmed Patel even a day before polling that his vote was "reserved" for Patel, according to a source in the party.
Meanwhile, the JDU has sacked Gujarat General Secretary Arun Srivastava for writing to the Returning Officer over the appointment of the party's election agent when he was not directed to do so, reported news agency ANI.