Pauline Hanson in the context of "Fish and chip shop"

Preselection is the process by which a candidate is selected, usually by a political party, to contest an election for political office. It is also referred to as candidate selection. It is a fundamental function of political parties. The preselection process may involve the party's executive or leader selecting a candidate or be some contested process. In countries that adopt Westminster-style responsible government, preselection is also the first step on the path to a position in the executive. The selected candidate is commonly referred to as the party's endorsed candidate.

Deselection or disendorsement is the opposite procedure, when the political party withdraws its support from one of its elected office-holders. The party may then select a replacement candidate at the subsequent election, or it may decide (or be compelled by the electoral timetable) to forgo contesting that seat (for example, the Liberal Party of Australia after Pauline Hanson was disendorsed just before the 1996 House of Representatives election, and likewise the Labour candidate for Moray, Stuart Maclennan, just before the 2010 UK general election). The deselected representative is usually free to still contest the election as an Independent or as a representative of another party, though they are usually at high risk of being unseated.