This is my comment in response to offstumped's post on Mayawati's victory
I think we are not giving enough credit where it is due. Arjun Singh should be credited with destroying BJP in UP. His Mandal 2 forced BJP to side either with their traditional upper caste votebank or to pick the emerging OBC votebank. BJP picked the OBC, paving way for Mayawati to run away with the upper caste votes. If this upper caste disenchantment with the BJP spreads to the rest of the North India, BJP may increasing start looking like the Congress, a party in the wilderness.
I will try and elaborate this point in a post in the near future