Returning to Thailand, Noppadon practised law in Bangkok and became Chuan's secretary during his period as Leader of the Opposition in 1995–97. He was elected as a Democrat Party Member of Parliament in 1996. He was a member of the Parliament of Thailand's Standing Committee on Foreign Affairs from 1996, and when Chuan became prime minister in 1997 he became an influential figure. He was Parliamentary Secretary to Foreign Minister Surin Pitsuwan in 1999–2001.[2]
Chuan's government was defeated at the 2001 election, and Noppadon was not re-elected to Parliament and returned to his law practice. In May 2006, he defected to Thaksin's Thai Rak Thai party, and was briefly Vice Minister of Natural Resources and Environment in Thaksin's government before it was deposed in the September coup. His defection was engineered by Thaksin's Natural Resources and Environment minister, Yongyuth Tiyapairat, also a former Democrat MP.[3] He maintains he defected for "ideological reasons" and not for personal gain.
In November 2006, Thaksin, who was in exile following the coup, appointed Noppadon as his legal adviser, in matters relating both to his status in Thailand and his business affairs in Britain and elsewhere. In this capacity he defended Thaksin against the National Counter Corruption Commission (NCCC), which had alleged that Thaksin's purchase of the Manchester City Football Club showed that he was concealing assets allegedly gained through corruption while in office. He challenged the NCCC to examine Thaksin's asset statements, arguing that the purchase of the club was not financed by hidden wealth. He argued that Thaksin financed the purchase with "honest earnings" and that Thaksin was "not obliged" to declare funds held by his adult children, relatives and close associates.[4]
In 2007 Noppadon became a member of Samak's new People's Power Party, which is generally regarded as the successor to Thai Rak Thai. As an adviser to Thaksin, he acted as a link between Thaksin in exile and the People's Power leadership in Thailand. Soon after taking office, he expressed his view that Thaksin's diplomatic passport, revoked after the coup, should be restored.[5] He also expressed the view that Thaksin would return to Thailand, where he faces corruption charges, "before May."[6]
Samak Sundaravej's 5-month-old government was in great trouble on July 10, 2008 after Noppadon Pattama, as 3rd top official in the ruling People Power Party (PPP) resigned, effective Monday. Its deputy leader Yongyut Tiyapairat, was banned from politics for 5 years, after the Supreme Court affirmed vote buying charges against him. Then, Chiya Sasomsub was removed from office by another top court, for illegally concealing his wife's assets. The Constitutional Court ruled on July 8 that Noppadon and the entire cabinet violated the charter by failing to ask parliamentary approval for a Cambodia deal. Noppadon signed the agreement on June, to support Cambodia's bid to seek World Heritage status for the 900-year-old temple of Preah Vihear.[7] The Opposition filed a petition with deputy Senate Speaker Nikom Wairatpanit to impeach Noppadon Pattama over Preah Vihear Temple issue because he violated the laws by not seeking congress's approval before signing over Preah Vihear to Cambodia causing Thailand to lose the land. Sathit Wongnongtoei submitted 141 signatures of MPs. Noppadon was accused of violating Article 190 and 270 of the Constitution. The Opposition filed the motion before Noppadon stepped down.[8]
