BSP President Mayawati took on both Prime Minister Narendra Modi as well as the Congress on Friday as she campaigned in the Lok Sabha elections for the BSP candidates in Delhi.Accusing Modi of failing to work for the weaker sections, she told an election rally in Dilshad Garden area: "Chowkidari won't save the 'chowkidar'."The former Uttar Pradesh Chief Minister added: "This time Modi must be told that after the failed policies of his government, his 'Chowkidar' tactic will fall flat after the results are announced on May 23."The BSP has named Rajvir Singh from North East Delhi, Sanjay Gehlot from East Delhi, Sita Sharan from West Delhi, Shahid Ali from Chandhni Chowk and Siddhant Gautam from South Delhi.Mayawati alleged that like the previous governments at the Centre, the Modi government had also disappointed the SC and ST communities and other weaker sections. The present government has failed to meet even a fourth of the promises made by Modi, she said.Mayawati also blamed the Congress for the problems of the Dalits and minorities."After independence, they were in power at the Centre and in most states but still the grand old party failed to provide proper legal rights to the SC/ST communities."She accused India's first Prime Minister Jawaharlal Nehru of ignoring B.R. Ambedkar's advice to take strict action so the SC and ST communities can get their legal due.She also criticized the Congress' promised Nyay scheme and said that if her party leads the government at the Centre, she will ensure that people from weaker sections get permanent jobs and not just Rs 6,000 a month.Mayawati claimed that the Congress was in a bad shape in Uttar Pradesh but the BJP was in a far worse condition. She alleged that the state government had used the government machinery to stop the BSP-SP alliance from winning.