In February 2001, Bradshaw was appointed interim leader of the federal Green Party, via election by the board. Bradshaw helped organize the 2003 Green Party Leadership Convention in Ottawa, and was responsible for moving the party's central office to Ottawa from Toronto. In February 2003, he was succeeded as party leader by Jim Harris. At the 2002 national convention in Montreal, he was elected leader, with the understanding that the post would be filled on a more permanent basis in early 2003 via mail-in ballots.