Factors like consolidation of opposition votes and well-entrenched rival candidates against BJP's perceived fumbling in picking its nominees have come together to make contests close in this high-profile seat.
BJP President Amit Shah might have dismissed opposition's suggestions that multiple public events by Modi here besides deployment of a number of union ministers and top party leaders in campaigning is indicative of "desperation" in his ranks but it is clear that his party is going out of the way to ensure a good saffron show.
He, however, told PTI that the overdrive may end up helping the saffron party by winning over floating voters who are guided by the "wave".
The BJP had won three of the five seats falling in the Varanasi parliamentary constituency in 2012 and has changed two of the three winners this time round.
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The party leadership has worked overtime to placate Chaudhari, well-regarded for his affability and accessibility, with Shah reaching out to him.
The change in Cantonment has invited allegations of dynasty politics as the Srivastava family has long held the constituency and even Saurabh Srivastava's late father was an MLA before his mother stepped in his shoes.
In Varanasi North, Muslims are in substantial numbers and have rallied around the Samajwadi Party-Congress candidate and former MLA Abdul Samad Ansari.
Even in the Cantonment seat, the SP and the Congress had together got more votes than the winning BJP candidate last time.
The SP has sitting MLAs in Sevapuri and Rohaniya, two remaining seats, and its alliance with the Congress is expected to bring in extra votes.
Both the BJP and its ally Apna Dal are in the fray in Rohaniya as they could not reach an agreement on this seat.
However, BJP leaders have expressed confidence that Modi's chemistry will prevail over the arithmetic advantage the alliance enjoys.
"We love Modi. Of course, our party erred in choice of candidates. But it won't have an impact. Varanasi cannot ignore the prime minister," said Ajit Misra, a local BJP worker.
The saffron party had expected that Modi's road show yesterday will clearly turn the tide in its favour but an equally impressive show of strength by Chief Minister Akhilesh Yadav and Congress vice president Rahul Gandhi later in the day showed the alliance's formidable presence.