"Congress government has launched several public welfare schemes and polices but failed in marketing them," he said and added, "BJP is good at the same job as it does one work and publicises it ten times".
"They (BJP) tell a lie hundred times and project it as truth to the public," the Congress general secretary told reporters.
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He ruled out the possibility of Congress' poor performance in recent assembly polls having any adverse effect on Lok Sabha election results, saying "issues and agenda of both assembly and Lok Sabha elections are different".
He expressed confidence that Congress would form the next government at the Centre.
Singh also lashed out at AAP leader Arvind Kejriwal for taking support of Congress for forming government in Delhi.