Rajbeer Singh lost the state election this year.
Kalyan Singh is known to be a family man, so much so that he tagged along the Samajwadi Party chief Mulayam Singh Yadav to establish his son. Rajbeer Singh became a minister in the Mulayam government in 2003.
BJP insiders say the groundwork for Kalyan Singh's return was done by Uma Bharti, who had sided with him even when he was attacking former prime minister Atal Bihari Vajpayee and other BJP leaders.
Uma Bharti has networked with Gadkari to bring back Kalyan Singh and cement the one-time OBC vote bank with the larger Hindutva support base.
