BJP's campaign in Bihar assembly polls today received a shot in the arm with JD-U MLA Satish Kumar, who had defeated RJD chief Lalu Prasad's wife Rabri Devi from Raghopur constituency in 2010 elections, joining it today.

BJP is likely to field him from Raghopur from where Prasad's son Tejaswi Yadav is also set to make his electoral debut.

Kumar said Bihar could develop only by following Prime Minister Narendra Modi's developmental agenda and accused Chief Minister Nitish Kumar to betraying the people of state by joining hands with Prasad who, he alleged, is pushing it towards 'jungle raaj'.

Sources said he was peeved with JD-U's decision to concede Raghopur seat to Prasad. Welcoming him into BJP, party secretary Shrikant Sharma said Modi-led BJP is the ambassador of development and good governance and Kumar's entry will strengthen the party's campaign.