Raja would file his nomination papers tomorrow, before the deadline for submitting candidature ends, CPI All India General Secretary Sudhakar Reddy told a press conference here.
Reddy spiked reports in a section of the press that Raja has filed his nomination papers remarking "how can it happen. Today is Sunday. He (Raja) is preparing his nomination papers. Raja will file them tomorrow before 3 PM".
CPI held its state executive here yesterday at which the issue of entering the RS poll fray and field Raja was endorsed, he said.
Reddy said CPI hoped that those parties who are not contesting the election and those who have surplus votes will support Raja candidature.
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AIADMK by contesting five of the six seats has upset the calculations of CPI, which had earlier banked on the ruling dispensation support to Raja, for another term.
DMK has already nominated its candidate Kanimozhi and has also been making efforts to lure other parties to ensure her victory for a second successive term.
DMDK has so far not decided on fielding its candidate though it is the principle opposition party and is yet to announce its plans for the upcoming RS election.