support base consists of the low-class workers who dream about Ram temple without bothering about jobs etc, and the city-dwelling professional people. However professional people of India strongly admire Manmohan Singh and believe that he does think well of India. So by going against deal, BJP is strongly alienating its professional people vote-bank. The upshot of all this would be that these people will not vote and hence BJP will be in a bad position and its strength might go down. The Indian voter is no longer goes by party alone. It is development, growth and jobs that matter to the voter.
