2004, were supplanting the Democrats as a substantial third party. The trend was noted that year by political scientists Dean Jaensch et al. Support for the Australian Democrats fell significantly at the 2004 federal election in which they achieved only 2.4 per cent of the national vote. Nowhere was this more noticeable than in their key support base of suburban Adelaide in South Australia, where they received between 1 and 4 percent of the lower house vote; by comparison, they tallied between 7 and 31 per cent of the vote in 2001. No Democrat senators were elected, though four kept their seats due to being elected in 2001, thus their representation fell from eight senators to four. Three incumbent senators were defeated: Aden Ridgeway (NSW), Brian Greig (WA) and John Cherry (Qld). Following the loss, the customary post-election leadership ballot installed Allison as leader, with Bartlett as her deputy. From 1 July 2005 the Australian Democrats lost official parliamentary party status, being represented by only four senators while the governing Liberal-National Coalition gained a majority and potential control of the Senate—the first time this advantage had been enjoyed by any government since 1980. On 28 August 2006, the founder of the Australian Democrats, Don Chipp, died. Former prime minister Bob Hawke said: "... there is a coincidental timing almost between the passing of Don Chipp and what I think is the death throes of the Democrats." In November 2006, the Australian Democrats fared very poorly in the Victorian state election, receiving a Legislative Council vote tally of only 0.83%, less than half of the party's result in 2002 (1.79 per cent). The Democrats again had no success at the 2007 federal election, and lost all four of their remaining Senate seats. Two incumbent senators, Lyn Allison (Victoria) and Andrew Bartlett (Queensland), were defeated, their seats both reverting to major parties. Their two remaining colleagues, Andrew Murray (WA) and Natasha Stott Despoja (SA), retired. All four senators' terms expired on 30 June 2008—leaving the Australian Democrats with no federal representation for the first time since its founding in 1977. Later, in 2009, Jaensch suggested it was possible the Democrats could make a political comeback at the 2010 South Australian election, but this did not occur. State/territory losses The Tasmanian division of the party was deregistered for having insufficient members in January 2006. At the 2006 South Australian election, the Australian Democrats