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In 2001, he was elected from the Vandur Constituency to the Kerala Legislative Assembly and later became Minister with portfolios of social, cultural and youth affairs in the Oommen Chandy Ministry in 2004.
He holds the records of having presented the maximum number of eleven budgets in the Kerala Legislative Assembly as Finance Minister and also as the longest-serving member of Kerala Assembly.
The Kilimanoor Assembly Constituency of Kerala Legislative Assembly consists of Pazhayakunnummel Pulimath, Kilimanoor Grama Panchayath, Nagaroor, Madavoor, Pallickal-Kilimanoor, Karavaram, Mudakkal and Navaikkulam Panchayats.
He was elected to the Kerala Legislative Assembly in the General Elections of 1967 from Punalur Constituency and re-elected to the Assembly from Chadayamangalam Constituency in 1971 General Election.
P. T. Chacko was elected to the first Kerala Legislative Assembly from Vazhoor constituency and became the first Leader of Opposition of the newly formed state of Kerala.
Though Congress gained majority of seats in the Elections of 1960 to the Kerala Legislative Assembly, Pattom Thanupillai of the Praja Socialist Party was given the Chief Ministership (CM) and Sankar became the Deputy Chief Minister in the Pattom Thanupillai ministry.