THE Left Democratic Front (LDF) has expanded further in Kerala as four more parties, the Indian National League, Kerala Congress (B), Democratic Kerala Congress and Loktantrik Janata Dal join it, said A Vijayaraghavan, the convener of the front.While the Loktantrik Janata Dal is led at the national level by Sharad Yadav and Veerendra Kumar, MP, MV Sreyams Kumar is the chief at the state-level. The Democratic Kerala Congress led by Francis George, former MP, is a splinter group of Kerala Congress.