While Bharati is relying on sympathy for her father, imprisoned in the Ranchi jail in the fodder scam, her BJP opponent is flaunting the appeal of Prime Minister Narendra Modi and his development plank.
The fight between the two Yadavs is being termed as one between the "uncle" and "niece".
Once with the Rashtriya Janata Dal (RJD), Ram Kripal Yadav joined the Bharatiya Janata Party (BJP) in 2014 after being denied a ticket from Patliputra. Amid a Modi wave, he defeated Misa Bharti by over 40,000 votes then.
Some of the other candidates in the fray then were Janata Dal-United candidate Ranjan Prasad Yadav and Communist Party of India (Marxist-Leninist) nominee Rameshwar Prasad.
Primarily a rural area, the Patliputra seat includes six Assembly constituencies Danapur, Maner, Paliganj, Phulwari, Masaurhi and Vikram. While the RJD and the Congress hold two Assembly seats each, two are with the National Democratic Alliance (NDA).
In these elections, the CPI and Congress and several other parties are allied with the RJD, while Ram Vilas Paswan's Lok Janshakti Party (LJP) is in the NDA.
Says Patna College Professor N.K. Chaudhary: "If Ram Kripal has his work to show, Misa Bharati is banking on his father's charisma. The RJD is constantly trying to fan the sympathy for Lalu Prasad in its favour. The fight is between sympathy and development."
Bharati, who is campaigning with her mother and former Bihar Chief Minister Rabri Devi, keeps reminding the voters not to forget the humiliation heaped on her father.
One observer, Santosh Singh, felt the contest will split the Yadav votes.
"Though the Yadavs have been hardcore RJD supporters, another Yadav in the contest is bound to cause division. The BJP will get the upper caste votes."
Patliputra votes on Sunday in the seventh and final phase of polling for the Lok Sabha battle.