"Congress president Sonia Gandhi has approved the candidature of Vayalar Ravi as Congress candidate to contest the ensuing biennial election to the Rajya Sabha from Kerala," a party release said.

Ravi's term in the upper house is set to end on April 21.

Two other Rajya Sabha members from the state - M.P. Achuthan of the Communist Party of India and P. Rajeeve of the Communist Party of India-Marxist - will also retire on the same day.

The state is ruled by the Congress-headed United Democratic Front.

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