It was announced after a CLP meeting here which stretched for several hours. The meeting was attended by former Delhi Chief Minister Sheila Dikshit as representative of the central leadership. She also held one on one meeting with all the 22 party MLAs.
Chennithala's election was "unanimous". AICC chief Sonia Gandhi has approved the decision, Dikshit said at a press conference.
Former Chief Minister Oommen Chandy said he proposed the name of Chennithala and three other MLAs supported him.IUML leader P K Kunhalikutty would be the Deputy Leader of UDF in the House, he said.
He also served as president of the national Youth Congress in 1990 and became a known face of the Congress at state and national levels. After becoming the joint secretary of AICC, he went on to be appointed as KPCC chief during 2006-14.
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Chennithala, a four-time member of Parliament and member of Legislative Assembly, said the new position was a challenging task as Congress is not in power both in the state and at the Centre.
He expressed confidence that he would be able to bring Congress back to its past glory.
The election of Chennithala as the CLP leader assumes
significance as he replaces Ommen Chandy, who had expressed reservation over taking the post in the wake of party debacle in the Assembly polls.
Congress-led UDF has 47 MLAs in the 140-member assembly.
The lead partner has 22 MLAs while IUML 18, KC(M) 6 and KC(J) 1.
The ruling LDF has 91 MLAs. One seat was won by BJP and another by independent.