One of the biggest setbacks for the Congress this time is former Delhi assembly speaker Prem Singh's defeat in the Ambedkar Nagar seat.
Singh, 80, holds the record of never losing an election in the past 50 years.
This time Aam Aadmi Party (AAP) candidate Ashok Kumar Chauhan, a political rookie, defeated the Congress leader, bagging 36,239 votes. Singh got 19,573 votes and came third.
A resident of Neb Sarai who has three flats in his name, Chauhan has studied up to Class 12. He relied on his clean image, the AAP's key poll plank.
On the other hand, Singh contested his 12th election this time. A registered record holder, he had won his first poll for Delhi Municipal Corporation in 1956 and served two terms in the municipal corporation.
When the council was constituted in 1966, Singh was elected as its executive member and won elections - irrespective of who came to power.
In 1993, when Delhi assembly was reconstituted and its first election took place, Singh was one of the 14 Congress members in the 70-seat House. He was re-elected in 1998, 2003 and 2008.
"People in my constituency love me and support me. I could win all elections in the past 55 years because of them," Singh had told HT a few days ago.
Ambedkar Nagar is the constituency where Congress vice-president Rahul Gandhi's rally was met with a lukewarm response in mid-November. Only a few days later, BJP prime ministerial candidate Narendra Modi's public rally at the same venue had received a tremendous response.
However, it was the AAP candidate who had the last laugh here.