Sahu submitted her documents at the sub-collector's office in Padampur, Bargarh district, in the presence of senior leaders and ministers, including Prafulla Mallick, Susanta Singh, Niranjan Pujari and Snehangini Chhuria.
The by-election was necessitated following the death of Subal Sahu, three-time Congress MLA from the seat, in August last year.
Rita Sahu, wife of Subal Sahu, joined the ruling party a month after.
"BJD president and Chief Minister Naveen Patnaik will campaign at Bijepur for a day," said BJD Rajya Sabha MP Prasanna Acharya.
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BJP nominee from the seat and former MLA Ashok Panigrahi filed his nomination from the seat on February 2.
Congress candidate Pranaya Sahu is scheduled to submit his papers tomorrow, the last day for filing of nominations from the seat.
The result of the by-election will be declared on February 28.
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