After AAP won the Rajinder Nagar Assembly bypoll in Delhi, Chief Minister Arvind Kejriwal on Sunday called it a defeat of BJP's "dirty politics" and thanked the people for appreciating the work done by AAP. Durgesh Pathak has defeated his immediate rival Rajesh Bhatia (of BJP) by a margin of over 11,000 votes, Delhi Chief Electoral Officer Ranbir Singh said.