"The election results are not very encouraging for Congress, but in democracy we have to respect people's verdict," he said.
Assam and Kerala are two important states that Congress have lost, Singh said adding, "Even in Tamil Nadu and West Bengal, our alliance could not make it. In Assam, we faced anti-incumbency and at the last moment one of our senior leaders joined BJP."
The Congress General Secretary said his party accepts the people's verdict and will serve them by sitting in opposition.
The former Madhya Pradesh Chief Minister alleged, "BJP wins elections by polarising votes on the basis of religion."
Congress is hoping to revive its position through Goa Assembly polls slated to be held next year, Singh said.