CPM cannot hope to rule Kerala like West Bengal becos the Christian, Muslim and Nair lobbies have their own political groups to counter the Communist oligrachy with a sprinkling of Congress part thrown in.
More than Congress, it is the strength of the Christan dominated Kerala Congress and Muslim League that is stopping a repeat of West Bengal in Kerala. Nair strength is on the decline. Let Mamata build a similar coalition of anti-CPM castes and relgions and align them into a strong confederation; it will see the end of CPM rule like the collapse of nine pins.