To buttress his argument, he said in the previous polls, Atal Bihari Vajpayee dominated the campaign and subsequently L K Advani.
Attacking the Congress, he said it had ruled the country for 55 years but failed to establish social and communal harmony in the country.
"We want to do that, we want to establish social harmony and communal harmony so that we can take the entire society along," the BJP leader said.
He was asked about the assertion by his colleague Uma Bharti that the Congress President Sonia Gandhi's son-in-law Robert Vadra would be "in jail" if the NDA formed the next government.
On this, Singh said, "It is not about Robert Vadra but whoever has cases, those will be probed and judiciary will do the needful."
He insisted that "BJP never indulges in vindictive politics. We never keep revengeful attitude. Law will do its work."