Nag represented Antagarh in the Chhattisgarh Legislative Assembly after winning a by-election in 2014. In the 2024 Lok Sabha election the BJP fielded him from Kanker, and he defeated Congress candidate Biresh Thakur by 1,884 votes (5,97,624 to 5,95,740) in one of the closest contests in the state. He has spoken in the Lok Sabha on railway grants and on development in the Kanker region.
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