Gandhi, BSP's Brahmin leader Pawan Pandey and 12 others are up against 'Raani sahiba' Amita Singh who is fighting her first parliamentary election on Congress ticket after her husband and sitting MP Sanjay Singh, known as 'Raja sahib', was nominated to Rajya Sabha by the party a few months ago.
Pandey has more than 30 cases, including serious charges of murder and rioting against him.
Political circles are abuzz with talk of "lotus bloom" after Gandhi's advent here from Pilibhit, where he last time won by a whopping margin of 2.8 lakh votes.
Observers say Congress finds itself on a sticky wicket at Sultanpur seat, adjacent to Nehru-Gandhi family bastions of Raebareli and Amethi, with SP and BSP also having fielded strong local candidates, who are campaigning aggressively.
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Eyeing Muslim votes, Samajwadi Party has fielded Shakeel Ahmed, a transporter. Muslim youths in Rasoolabad, Harakpur, Meenapur, Aliganj and Islamganj seem inclined towards SP, though a divide in Muslim votes primarily between SP and Congress cannot be ruled out.
What also works to Ahmed's advantage, say political pundits, is that BSP has dropped its Muslim candidate, Tahir, a former MP, who was the runner up in the 2009 polls.
Some say it is too early to write off the strength of Singh as the erstwhile 'raja' has a strong loyal band of supporters, who would rally behind Amita as well.
On the other hand, BJP is hoping that caste combinations crumble in the constituency under the impact of Gandhi surname and 'Modi wave', marking a turnaround for the party here after its vote share hit lows in past three elections.