JSP state president Manoj Bharti alleged that false and misleading posters targeting Kishor had been put up at several intersections in Patna over the past two days.
While BJP leaders are projecting the contest as a battle of organisational strength, the JSP is presenting it as a challenge to conventional party politics.
The three leaders, along with hundreds of their supporters, were inducted into the BJP in the presence of senior party leaders, including state president Sanjay Saraogi.
Many voters expect the BJP to retain the seat, but with a reduced margin compared to its victory by more than 44,000 votes in the 2025 Assembly election.
Abhishek Kumar cites family reasons for pulling out a day after filing his nomination, leaving the BJP to pick a new candidate before the July 13 deadline.