The opposition United Democratic Front (UDF) is led by Congress with 24 members in the 140-seat house.
Other constituents are the Kerala Congress (Mani) with 11 seats, Indian Union Muslim League with 7, Socialist Janata Democratic (Virendra Kumar) with 3, and Kerala Congress-B, JSS and Indian National League with one seat each.
UDF is also supported by one independent.
The ruling Left Democratic Front's (LDF) major constituent is the Communist Party of India-Marxist (CPI-M) with 61 seats, followed by the Communist Party of India (17), Revolutionary Socialist Party (3), the Nationalist Congress Party (2), Janata Dal-Secular (2), Kerala Congress (Thomas) (1) and Congress-S (1).
The LDF also includes three Left-supported independents.
One seat in the assembly is vacant.
For the CPI-M, another issue to decide is whether Chief Minister V.S. Achuthandan, 87, will lead the front in this election.
The first support for Achuthanandan came Wednesday when RSP chief V.P. Ramakrishna Pillai said the chief minister's image will help the LDF.
"Finally, the decision on who is to lead the LDF will be decided by the CPI-M. In all, we want seven seats this time to contest," said Pillai.