At the August 2010 elections for Australia’s Parliament, the voters of Longman, Queensland, elected Roy Wyatt. He had been nominated at the age of 19, before he had even voted, although by the time of the election he had turned 20. Here is a feature story about him, focused on his speech in the House of Representatives announcing that he is now 21. Thanks to Sam Harley for the link. Roy is a member of the Liberal National Party.
The Liberal Party (free market conservatives) and the smaller National Party (agrarian based social conservatives) always form a post-election coalition called, simply enough, The Coalition.
In a few Australian subdivisions, this has been taken a bit further. In the Northern Territories, the two parties have merged on the local level to form the Country Liberal Party (the National Party used to be called the Country Party).
More recently in Queensland, the Liberal National Party was formed in the same fashion. Traditionally, Queensland had been the only state where the Nationals were more popular than the Liberals. The tides have slowly been turning though so the Nationals pushed for the merger while they would still be the ones to set the rules.