It was the first time Labour had lost a seat at a Westminster by-election in Scotland since the Scottish National Party won the Glasgow Govan by-election in 1988, and the first time Labour had ever lost to the Liberal Democrats, or their predecessors the Liberal Party, in a Scottish Westminster by-election. The by-election took place in the middle of a leadership election in the Liberal Democrats and the party was perceived in the media to be declining in the polls as a result of negative publicity surrounding the resignation of former leader Charles Kennedy and revelations about the private lives of Mark Oaten and Simon Hughes.