West Bengal state Chief Minister Mamata Banerjee (L) participates in an event honouring the birthday of Nepali Poet Bhanu Bhakta in Kalimpong on July 13, 2012. The Gorkhaland Territorial Administration polls are scheduled to be held on July 29. Indian Gorkhas, who are ethnic Nepalese, have led a violent campaign since the 1980s demanding that the separate state of Gorkhaland be carved out of West Bengal's mountainous district of Darjeeling.