<p>West Bengal's Nandigram constituency is witnessing a showdown between TMC supremo Mamata Banerjee and Suvendu Adhikari, her former <span jsslot=""><span data-dobid="hdw">protégé</span></span> who joined the BJP.</p>.<p>Soumya Das reports on how the Nandigram election fight will impact the very political existence of the allies-turned-foes.</p>