The election was triggered when co-leader Jeanette Fitzsimons resigned in February 2009, intending to retire from active politics.

[1] The Greens election process for co-leader was decided by a STV (single transferable vote) system.

She stated her leadership style if elected would be focused on the grassroots and represent a "steady as she goes" approach.

She was best known publicly for championing controversial changes to child discipline laws, particularly the repeal of Section 59 of the Crimes Act.

[5][6] Bradford announced on 25 September her intention to resign as a Member of Parliament in late October, citing disappointment after her loss in the leadership election as well as wishing to take new directions.