'We are pleased to announce the candidature of @sagarikaghose, @SushmitaDevAITC, @MdNadimulHaque6 and Mamata Bala Thakur for the forthcoming Rajya Sabha elections,' the party said in a tweet.
Mitra, who had resigned from the BJP a few days ago, is considered close to veteran leader L K Advani.
The new Lok Sabha will have 300 MPs who have been elected for the first time to the Lower House.
Trinamool Congress and the Bharatiya Janata Party are contesting in all the 30 seats, while the Communist Party of India-Marxist is in the fray in 15 and its alliance partners of Sanjukta Morcha the Congress and ISF are competing in 13 and two seats respectively.
Once a reviled practice in the state, both the parties seem to have endorsed a record number of turncoats this time -- triggering a wave of discontentment among their loyalists.
