All Bengalis are not REDs. In fact, very few of them are REDs. But, CPM manage to win election in Bengal through their rigging machinery. Congress also help them and takes help from them to form the central govt. If fair elections are held in Bengal, then Left can't come to power there.
DMK is part of the UPA govt, which is getting Left Support. By this logic, will Tamils are to be kicked out of Tamil Nadu, just because many of them have voted for DMK ?
Instead of kicking Bengali, Mallus, Gaulties etc. out of Tamil Nadu, let's kick all Left politicians (irrespective of which state they are from) out of India.