Mayo by-election, 2008

A by-election was held for the Australian House of Representatives seat of Mayo, located in Adelaide, South Australia, on 6 September 2008, following the retirement of Liberal Party MP and former Liberal leader Alexander Downer. The by-election was held on the same day as the Lyne by-election, and the Western Australian state election.

The writ for the by-election was issued 4 August, with the rolls closing on 8 August. Candidate nominations closed on 14 August. The by-election was contested on the same boundaries drawn for Mayo at the 2007 federal election. The seat was won by Jamie Briggs of the Liberal Party on a two-candidate preferred vote of 53 per cent against the Greens.

Downer first won the seat of Mayo at its creation at the 1984 federal election. He retained the seat at each subsequent election. The 2007 Liberal two-party-preferred vote of 57.1 percent was at the time the narrowest in the seat's history. Except for 1998, the seat was won at each election by the Liberals on primary votes alone. Despite this, the Australian Democrats and independents have traditionally polled well, including two elections where the Democrats and independent Brian Deegan came second. At the 1998 election the Democrats reduced the Mayo Liberal margin to just 1.7 percent.

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