It will seem interesting and unbelievable that for thirty years since Independence, India was under a single one party rule. The Indian National Congress was ruling the country from 1947 onwards till 1977 when it got completely defeated at the hands of the newly formed Janata Party, which came in to being during the draconian Emergency, under the leadership of Lok Nayak Jayaprakash Narayan. The formation of a non-Congress government completely changed the politics in the country. Since then, it has been mostly coalition Governments whether it is led by Congress, BJP or a combination of other parties as under the Prime Ministership of V.P.Singh.
Now nobody can even imagine a central government by a single party. Nobody can get more than 30% on their own strength. The local (state level) parties have become strong. Sometimes they dictate the ruling party, since without their help the latter can not be in power.
What Com. E.M.S.Namboodiripad predicted years earlier had come true. The single party rule in India is over. It can only be coalition governments.