The PM on Monday attended a rally in Hubli which is believed to be a stronghold of ruling Bhartiya Janata Party (BJP). Singh is also scheduled to attend another public meeting on the same day at the Gowda family bastion of Bangalore rural.
Addressing people in Hubli, the PM said, "I have come here on behalf of Congress party to ask for vote. Only Congress can work for this state's development."
"There is lack of communal harmony and a sense of insecurity prevails among minorities in Karnataka," added Singh while trying to woo the minority communities in the state.
The assembly elections will be held in Karnataka on May 5 and the results will be declared on May 8. Earlier on Sunday, Narendra Modi campaigned for BJP in Bangalore.