LUCKNOW, April 14 -- The 'blue wave' of political churning that started in Uttar Pradesh during the mid-80s and took the state by storm by mid-90s is now on the ebb. It was this big political upheaval created by the Bahujan Samaj Party that led its leader Mayawati to become the chief minister of the state for a record four terms, including the term of majority government from 2007- 2012. But the slide too has been rapid. Over a decade on, the BSP has lost the 'master key' to political power....