A lawyer, Kumar fought cases for economically and socially backward people, without taking any fees. He first met Arvind Kejriwal, who was later instrumental in founding the AAP, during the India Against Corruption movement in 2012. Kumar contested the 2013 Delhi Legislative Assembly elections as an AAP member in the Sultan Pur Majra Assembly constituency, which is reserved for Scheduled Caste candidates. He secured 30,346 votes, finishing second to the sitting Member of the Legislative Assembly, Jai Kishan of the Indian National Congress, by a margin of 1,112 votes. The AAP renominated Kumar for the constituency in the 2015 Delhi Legislative Assembly elections. He won with 80,269 votes. He defeated Kishan, who finished third, by 64,439 votes and also Parbhu Dayal, a Municipal Corporation of Delhi councillor of the Bharatiya Janata Party. Polling the highest percentage margin of any winning candidate, at 56 per cent, he was described as a "giant killer" by The Financial Express for defeating the four-times elected Kishan. After the AAP's defeat in Delhi in the 2014 Indian general election, where all seven Delhi seats were won by BJP, Kumar and other volunteers were credited with revival at the grass-root levels. He conducted several corner meetings and organised door-to-door voter connect campaign to increase the voter base in North West Delhi. His elevation as minister of SC/ST Welfare and Women and Child Welfare, in Kejriwal's cabinet was regarded as a recognition of his efforts for the party. The ministry was previously held by Rakhi Birla, who courted controversy in the last Kejriwal cabinet. He was also placed in charge of the social welfare and language ministries. With average age of 42 years, the cabinet was described as the "youngest" in the country, and 34-year-old Kumar was its youngest member. Kumar was removed by Delhi Chief Minister Arvind Kejriwal on 31 August 2016 after he received a sex CD showing Kumar in a compromising position having sex with two women. Kumar was arrested by Delhi Police on 3 September 2016 after a woman alleged he had spiked her drink, raped her and secretly filmed her. His membership of the AAP was suspended. He was subsequently expelled from the AAP and in September 2016 was placed in judicial custody for a fortnight. He was granted bail in November 2016, with the judge noting that any trial would have to determine several possible explanations for the actions that were claimed to be rape. Still a sitting member of the Assembly, it was alleged in April 2017 that Kumar had been voicing support for a BJP candidate in the then municipal council election campaign. The BJP distance themselves from the story, claiming that it was an attempt by the AAP to smear them. sandeep kumar ishur ladee age 21
