Congress' present Rajya Sabha member Bhubaneshwar Kalita and Lok Sabha member from Sultanpur in Uttar Pradesh Sanjay Singh filed their nominations, while the party's ally in the state Bodoland Peoples Front (BPF) have fielded its present member of the Upper House Biswajit Daimary.
Former journalist Haidar Hussain was the last candidate to file his nomination with support from the opposition in the Assam Legislative Assembly, comprising BJP, AGP and AIUDF.
"Today three candidates filed nominations, while one person filed yesterday. The last date of filing the nomination ended today," Assam Legislative Assembly Principal Secretary Gauranga Prasad Das told PTI here.
"The election will take place on February 7 morning and the results will be declared in the same day evening at 5 PM," Das, who is also the Returning Officer, said.
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The election will take place due to completion of terms on April 9 by three existing members. The three seats will be vacated by the three-time Rajya Sabha member and Congress state unit President Bhubaneswar Kalita, Asom Gana Parishad's Birendra Prasad Baishya and BPF's Biswajit Daimary.
On Singh's nomination, many organisations and political parties have criticised the Congress for supporting an outsider as the state's candidate.