LUCKNOW, April 21 -- Supporting caste census yet again and terming the exercise an 'X-Ray of India', senior Congress leader Rahul Gandhi on Saturday said if elected to power, INDIA bloc government will ensure it to ascertain population of various caste groups in the country. "No one knows how many backwards, Dalits and tribals are there (in the country)? Those who form the biggest chunks of population don't know their numbers. The BJP government does not want caste data," he said at the first joint rally of the INDIA bloc for the Lok Sabha polls in Uttar Pradesh's Amroha.P5...