Arnab, is not a fact your CPM supported Tinnaman. No govt in democracy can survive 6-7 terms. It is possiblem only if the elections are rigged or voters are fool.
It is human tendency not to remin stisfy . Thre is always a urge for a change after some time. Why only communits govts survive for 40-50 years ( russia, china, uguslaivia, Cuba etc. I feel elections are held there)