He was one of the 78 members who were selected from all over India by the Congress party to participate in the Dandi March which was held in 2005 to celebrate the 75th year of the same. When he first contested in an assembly election, he was still the KSU president, being the youngest legislative member he was named 'Baby MLA'. While he was MLA he also became National General Secretary of Indian Youth Congress and Election In-Charge of Youth Congress under the leadership of Mr. Rahul Gandhi and took charge of five states of South India (Tamilnadu, Karnataka, Pondichery, Andaman and Lakshadweep) where he established his ability, honesty and sincerity. Later, he resigned the post to contest in Youth Congress Organisational Election in Kerala and got the privilege to become the first elected president through an elaborate and unique process.
After he became Youth Congress President, he fought against the LDF Government's action of back-door appointments. He led a major secretariat march within the first month of taking charge of the post and fell victim to lathi-charge and was hospitalised.
P. C. Vishnunadh's performance in the assembly was noted by the public and the media. He raised several important issues like educational, environmental, youth related topics which got due recognition.
Vishnunadh resides in Chengannur, on the banks of the river Pamba, which is his constituency along with his poet, writer, and columnist wife Kanaka H. M.