PATNA, Aug. 4 -- BJP's defeat in the Bankipur assembly by-election has dealt a significant blow to its national president Nitin Nabin, with some political observers stating the loss in his family bastion has dented his image as an organiser, while others maintaining that more than Nabin's personal loss, the defeat is a reflection of voters' dissatisfaction with the ruling BJP.

The defeat carries symbolic weight far beyond the loss of a single assembly seat. Bankipur, BJP's stronghold for more than three decades, has been represented by Nabin and his late father, veteran BJP leader Navin Kishore Prasad Sinha, almost uninterruptedly since 1995.

The seat has been wrested by Jan Suraaj Party (JSP) founder Prashant Kishor, whose victory mark...