This will be the third consecutive day of electioneering by the Prime Minister here.
Since Friday, Modi has addressed as many as three public meetings and taken out two processions in open vehicles.
The Congress has lodged a complaint with the Election Commission that prior permission had not been sought for Friday's "roadshow", taken out hours before a similar show of strength by Rahul Gandhi and Akhilesh Yadav.
Today's rally appears strategically timed and placed as Modi will deliver his speech when less than a quarter of the day will be left before campaign comes to a close at 5 P.M.
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In the 2009 Lok Sabha elections, Murli Manohar Joshi won the seat for the BJP though the party trailed in Rohaniya behind the candidates of Samajwadi Party, BSP and Apna Dal, one of the reasons why his victory margin remained a slim 18,000 votes.
In the 2012 assembly polls, the BJP finished a distant fourth with its candidate securing a paltry 9.67 per cent of votes and forfeiting his deposit.
AD's Anupriya Patel was the sitting MLA from the seat and she went on to win from Mirzapur in the Lok Sabha polls riding the Modi wave.
Patel's party has suffered a split as she now heads one
of the factions and her mother leads the other.
The BJP, which is aggressively expanding its base among the OBCs, has claimed Rohaniya for itself leaving Sevapuri, the only other rural assembly segment in Varanasi, for Patel's party.
Rahul Gandhi and Akhilesh Yadav had recently visited the ashram.