Before getting the heart attack in 2008, Dasmunsi was with the All India Football Federation as a chief for 20 years.
Dasmunsi was the President of the Indian Youth Congress in West Bengal between 1970 and 1971 and later became a member of the Parliament. He became a minister for the first time in 1985 when he was sworn in as Union Minister of State for Commerce.
Following his victory in 1984 Lok Sabha election from Howrah, the late former PM Rajiv Gandhi inducted Dasmunsi in his Council of Ministers. Eventually, Dasmunsi became the president of the party in the State, but Congress lost badly in 1989. He was defeated again in 1991 but went to win in 1996 from Howrah. In 1999 and 2004, he won from Raiganj, where he started his politics.