President of Sadbhawana Party Rajendra Mahato was born on November 19, 1958 in Babargunj-8, Sarlahi. He is the son of Khobhari Mahato and Rajkumari Devi Mahato. He has a daughter and a son. He holds a Bachelor's Degree from Humanities Faculty and a Master's Degree in Law. He is contesting from Sarlahi-4 in the CA Election 2013 representing Sadbhawana Party.

He began his political career in 1990. He won the CA Election in 2008 from Sarlahi-4, defeating TMDP candidate Ramchandra Raya Yadav. Mahato received 17,073 votes to win the election while Yadav got 8752 votes. Rameshwar Raya of Madhesi Janadhikar Forum, Nepal came third with 6,939 votes.

Mahato is a familiar face in the government and parliament, and has been elected as MP on multiple occasions and became minister for supplies and health.