On 24 July 2008, Brokenshire replaced Andrew Evans in the South Australian Legislative Council (the Parliament's upper house), representing the conservative Family First Party.

Brokenshire provides political commentary on the community radio station 88.7 Coast FM monthly on the Thursday Magazine show, presented by Dave Hearn.

Brokenshire contested the seat of Kingston for the Family First Party in the 2007 federal election, receiving 5.71 percent of the vote.

[3][4] On 18 March 2008, he was chosen by Family First to replace Andrew Evans, who had retired from the Legislative Council,[5] and Brockenshire was sworn in on 24 July 2008.

[9] In 2017, Brokenshire and Dennis Hood joined the Australian Conservatives when Family First ceased to exist.