 Karalasingham stood as the LSSP candidate in Kankesanthurai at the March 1960 parliamentary election but on was defeated by S. J. V. Chelvanayakam, leader of the Illankai Tamil Arasu Kachchi.Whilst Ceylon's main political parties, the United National Party (UNP) and Sri Lanka Freedom Party (SLFP) supported the Sinhala Only Act, the leftists, led by the LSSP, opposed the act.In May 1960 LSSP leader Perera proposed that the party form a coalition government with SLFP.