2009 result: Congress's Kapil Sibal defeated BJP's Vijender Gupta by 2,00,710 votes.
Chandni Chowk will go to the polls on April 10.
[Read: Top contests of 2014]
About Kapil Sibal (Congress)
A lawyer by profession, Kapil Sibal, 66, has been in charge of various ministries in the UPA government over the years, including the ministries of science and technology, human resource development, communications and IT and law and justice. Sibal, who was first nominated as a member of the Upper House of the Parliament from Bihar in 1998.
In 2004, Sibal defeated the BJP's Smriti Irani by nearly 80,000 votes while in 2009, he beat the BJP's Vijender Gupta by over 2 lakh votes from the Chandni Chowk constituency.
About Ashutosh (AAP)
A known face in Hindi television journalism, Ashutosh was influenced by the agitation for Janlokpal under the leadership of Anna Hazare. Ashutosh also wrote a book on the matter titled Anna: 13 days that awakened India. He's the only non-English TV journalist to have received a prestigious UN scholarship. Ashutosh, who hails from Uttar Pradesh, joined the AAP in January this year and is its spokesperson now.
About Harsh Vardhan (BJP)
The former RSS member and a doctor by profession, Harsh Vardhan was the face of the BJP in the last year's assembly poll in Delhi. He had held responsibility of various portfolios in the Delhi state cabinet during the BJP's reign between 1993 and 1998. The 60-year-old leader, who has never lost an assembly election, could not become the chief minister of Delhi by a whisker for his party could not get an absolute majority.
Analysis: Sibal would face the anti-incumbency factor but the division of the anti-Congress votes between Ashutosh and Harsh Vardhan might favour him in the end.