Full disclosure: I included all the regional parties so I can judge whoever voted for them. Alas, the only choices with votes apart from INC and BJP are the CPI(M) and CPI (the difference being the former was a political machine in West Bengal and the other not so).
For those who voted for the CPI(M), the New Left Review (!) has a free (!!)
article on their implosion in West Bengal. The CPI is only relevant in Kerala, the butt of many jokes for its extraordinary welfare state but lagging economic growth.