In the 1984 general election, Banerjee became one of India's youngest parliamentarians ever, defeating veteran Communist politician Somnath Chatterjee, to win the Jadavpur parliamentary Constituency in West Bengal.
Pada pemilihan umum 1984, Banerjee menjadi salah satu anggota parlemen termuda di India yang pernah ada, mengalahkan politikus Komunis veteran Somnath Chatterjee, dari Konstituensi parlementer Jadavpur di Bengal Barat.