During both Samak Sundaravej and Somchai Wongsawat's brief terms as Prime Minister, Korn served as Shadow Finance Minister for the Democrat Party.
From 25 November to 3 December 2008 the Yellow Shirts, protesting Somchai Wongsawat's prime ministership, seized the two Bangkok airports (Suvarnabhumi and Don Mueang) and damaged Thailand's image and economy.