Chupong is known for his anti-monarchist views, which have resulted in a past arrest under Thailand's lèse majesté laws.

[5] Chupong entered mainstream politics, first as a member of the New Aspiration Party under the leadership of Chavalit Yongchaiyudh.

He was Union of State Enterprises of Thailand with Thanong Pho-an and Somsak Kosaisuk[9] and he was President of the Provincial Waterworks Authority.

Chupong became well known after the 2006 Thai coup d'état, as he was a prominent member of the United Front for Democracy Against Dictatorship.

[10] After February 2010 Chupong Theethuan asylum to Cambodia, Philippines and France[13] He criticize Government of Abhisit, Prayuth and Monarchy.