[4][5] Sadhu Yadav was born on 5 July 1967 in Salar Kalan village near Mirganj of Gopalganj district, Bihar.

[11][15] Two days after leaving the RJD, in March 2009, Sadhu Yadav joined the Indian National Congress (INC) and unsuccessfully contested the Paschim Champaran Lok Sabha constituency and lost to Sanjay Jaiswal.

[15][16] In March 2010 he was briefly suspended from the Indian National Congress[17] for allegedly challenging the party's policy strategy.

[14][18] Returning to the Gopalganj constituency, Yadav then fought and lost as a candidate for the INC in the 2010 Bihar legislative assembly election.

The candidates claimed that errors had resulted in the printing process for pre-election affidavits, and in Yadav's case this meant that he was recorded as aged 47 in 2009 when he had been shown as 44 at the time of the 2004 general elections.

[21] On 25 March 2014, he announced his candidature for 2014 Lok Sabha elections from Saran contesting against his sister and ex-Chief Minister of Bihar Rabri Devi.