Congress leader G Rathikumar announced his resignation from the party on Wednesday.
The development comes a day after another senior leader A P Anil Kumar parted ways with the party and joined rival CPM.
Rathikumar held the post of Kerala Pradesh Congress Committee (KPCC) general secretary for the past two-and-a-half years.
Anil Kumar, meanwhile, had hinted that more leaders from the Congress is expected to exit the party.
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