The candidature of Pranab Mukherjee, all set to resign from the Congress party in readiness for his new role in Rashtrapati Bhavan, has divided every major political formation right down the middle. The presidential sweepstakes have brought every faultline in the BJP and the NDA to the fore, with the Shiv Sena (its oldest ally) and the JD(U) openly breaking ranks with the party.