AAP national convenor Arvind Kejriwal on Sunday called his party's win in the Rajinder Nagar Assembly bypoll the "defeat of BJP's dirty politics" and thanked the people for appreciating the work done by his government in the national capital. The Aam Aadmi Party's (AAP) Durgesh Pathak defeated BJP candidate Rajesh Bhatia by a margin of over 11,000 votes in the bypoll, officials said.