Griffin joined the ALP in 1979 and was chosen as a delegate to state conference in 1984. He was secretary of the party's
Springvale South branch from 1990 to 1993. Griffin was elected to the Opposition Shadow Ministry in October 1998. He was Shadow Minister for Consumer Affairs and Shadow Minister Assisting the Shadow Minister for Health from 2003 to 2005. In June 2005, he was appointed Shadow Minister for Veterans' Affairs and Shadow Special Minister of State. After Labor won government back in the
2007 federal election, new Prime Minister
Kevin Rudd appointed Griffin
Minister for Veterans' Affairs in the
ministry. On 1 April 2010, he gained the portfolio of
Minister for Defence Personnel. He retained these portfolios in
Julia Gillard's
first ministry but chose not to continue in the
Second Gillard Ministry, which was sworn in on 14 September 2010 following the
2010 election. In the lead-up to the
2012 Australian Labor Party leadership spill, following continued leadership tensions between Rudd and Gillard, Griffin was reported to be a "main numbers man" for Rudd and publicly criticised federal treasurer
Wayne Swan for suggesting that Rudd was destabilising Gillard. On 10 February 2015, Griffin announced he would not contest the next election, due in
2016. In March 2015, former City of Port Phillip Mayor
Julian Hill was preselected unopposed to contest Bruce for the Labor Party. ==Later activities==