RANCHI, Oct. 11 -- Congress workers observed a 'Black Day' on Saturday, staging demonstrations here and at all district headquarters of Jharkhand, demanding the resignation of Chief Election Commissioner Gyanesh Kumar over alleged voter list manipulation. The party and other INDIA bloc constituents have been on the offensive over the issue, holding massive protests in the heart of Delhi for two days straight. The defiant street showdowns by a "united" opposition bloc are likely to continue, with Rahul Gandhi claiming that they would not stop till CEC Kumar resigns....