Congress candidate Meenakshi Chandela gave a spirited fight to the winner, Manjinder Singh Sirsa of BJP-SAD combine, but lost by a margin of 14,652 votes.
Delhi Congress chief Ajay Maken lauded party workers for the result and said the party's poll percentage has jumped from 12 per cent in 2015 Assembly elections to 33 per cent in this bypoll.
"Keep the spirit alive-we'll be the dark horse in MCD!," he tweeted.
"Within two years, Congress has been able to achieve 300 per cent growth in its vote share only due to the tireless efforts of its workers among the people of Delhi," Maken said.
More From This Section
Hitting out at the Aam Aadmi Party (AAP), whose candidate lost his security deposit in the bypoll, Maken said the verdict was a "referendum" on the party and its leader Delhi Chief Minister Arvind Kejriwal. It forecast AAP's defeat in the MCD polls scheduled to be held on April 23.
Quoting booth-wise vote share of the party's candidate, Maken claimed that Congress has received support of residents of resettlement colonies and unauthorised colonies, safai- karamcharis, street vendors and minorities "en mass".
"Our old, traditional voter base is now back," he said.
However, a section of Delhi Congress leaders who have been objecting to ticket distribution procedure for MCD polls by Maken's team, termed today's defeat as a "matter of concern" for the party.
"Moreover, many Sikh faces who were star campaigners in Punjab were kept away in Delhi. Even Sheila Dikshit, whose good governance continues to be a talking point, was kept away. The Congress could have done much better," he said.