 He joined the Kerala Congress the next year when it was formed and became its President, Kodakara Constituency Committee.Nambadan was elected to the Kerala Legislative Assembly in 1977, 1980 and 1982 from Kodakara constituency as a Kerala Congress Candidate.On 15 March 1982, Nambadan voted against the K. Karunakaran-led UDF government which was surviving on the casting vote of Assembly Speaker A. C. Jose.