Making his electoral debut, Kishor is now leading BJP candidate Neeraj Kumar by over 4,000 votes, as he eyes a major upset in the BJP's long-held stronghold.
The by-election to the Kayastha-dominated constituency was necessitated after BJP national president Nitin Nabin resigned from the seat following his election to the Rajya Sabha.
Bankipur has remained a BJP bastion since 1995, making the contest politically significant.
Kishor's decision to contest from Bankipur transformed what would otherwise have been a routine bypoll into one of Bihar's most closely watched political battles.
The Rashtriya Janata Dal (RJD) has fielded Rekha Kumari, who is currently in third place behind BJP's Neeraj Kumar, according to the latest counting trends.
Meanwhile, in the other Assembly bypolls, the Congress is leading in Madhya Pradesh's Datia constituency, while the BJP is ahead in Gujarat's Manjalpur constituency.
BJP's sweeping 2025 Bihar victory
The BJP-led National Democratic Alliance (NDA) secured around 202 of the 243 Assembly seats in the November 2025 Bihar elections, handing a crushing defeat to the RJD-led Mahagathbandhan.
The victory cemented the BJP's position as the dominant force within the NDA while ensuring Nitish Kumar returned as Chief Minister for a record tenth term.
What has changed since the 2025 election?
BJP's influence within the NDA grew: Although Nitish Kumar initially continued as Chief Minister, the BJP emerged as the largest partner in the coalition and secured key ministries, including the Home Department, signalling a significant shift in the alliance's power balance.
Samrat Choudhary replaced Nitish Kumar: In April 2026, Nitish Kumar resigned after being elected to the Rajya Sabha. BJP leader Samrat Choudhary succeeded him as Chief Minister, marking the first BJP-led government in Bihar under the NDA banner while the coalition remained intact.