An Actor turned Politician started his political career by being a member of the Bharatiya Janata Party but in 2019 he joined Congress. He entered politics by contesting in a by-election opposite Rajesh Khanna. Sinha quoted in an interview that his biggest regret in his life was contesting election against his friend Khanna. Khanna won the elections by beating Sinha by the good number of votes but however, he was hurt and never spoke to Sinha thereafter. Sinha did try to rebuild his friendship with Khanna, however that never happened till Khanna's death in 2012. He won the Patna Sahib Lok Sabha constituency in Bihar during the Indian general elections, 2009.
Apart from being a member of Lok Sabha (2009-2014, 2014-2019) and Rajya Sabha twice,
he became the cabinet minister in the Third Vajpayee ministry from the 13th Lok Sabha, holding two portfolios, the Department of Health and Family Welfare, and the department of shipping.
As of May 2006, he was appointed as the head of the BJP Culture and Arts Department.
Later, he defeated a Cinema Celebrity Shekhar Suman. He won the seat in the subsequent Indian general elections, 2014, as well. During 2019 Lok Sabha Elections, he left BJP and joined Congress Party. The Bollywood actor was fielded by the Congress party in 2019 general election from the prestigious Patna Sahib constituency but got handed over a defeat by his ex-colleague and BJP candidate Ravi Shankar Prasad.
The time turned and Bihari Babu went to Bengal. TMC chief Mamata Banerjee made him fight a by-poll on Asansol parliamentary constituency as Trinamool candidate and Mr. Sinha registered a massive victory over Agnimitra Paul of the BJP. The byelection on Asansol took place because a baffled Babul Supriyo shifted to TMC from BJP and resigned as the MP of Asansol.
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