A rump party is a political party that is formed by the remaining body of supporters and leaders who do not support a breakaway group that merges with another party, or forms a new party.
The rump party can have the name of the original party, or a new name.
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Examples:
- Alliance (New Zealand political party), following the departure of Green Party of Aotearoa New Zealand
- Alberta Liberal Party
- Bavaria Party
- The pro-protectionism Conservative Party in the UK after the breakaway of the free trade Peelite faction in 1846 over the repeal of the corn laws.
- Diverse conservative parties in Canada
- United Labour Party in New Zealand which had a remnant made up of moderates who did not join the new, more radical, Social Democratic Party.[1]
- Lega Nord
- Liberal Party (UK, 1989)
- Centre Party (Germany)
- Greater Romania Party
- National Party (South Africa) under leadership of DF Malan after formation of the United Party. NP still remained relatively strong.
- New National Party (South Africa), the new name of what remained of National Party under the leadership of FW de Klerk and Marthinus van Schalkwyk.
- The pro-Petre Roman wing of the National Salvation Front which transformed in 1993 into the Democratic Party
- Party of the Democratic Left (Slovakia, 2005), dissolved in 2015
- Progress Party (Denmark)
- The Rassemblement-UMP (Gathering-Union for a Popular Movement) was an ephemeral French legislative group, led by former Prime Minister François Fillon, which split from the Union for a Popular Movement in November 2012 after the internal contestation which followed the election of the party's president. Created on November 27, 2012, this dissident group was reintegrated with the UMP's parliamentary group after negotiations between the two rivals on January 16, 2013.[2][3]
- The Republicans (Germany)
- Saskatchewan Liberal Party, abandoned the liberal label in 2023
- Serbian Radical Party
- Social Democratic Party (UK, 1990–present)
- Social Democratic Party of Hungary
- Social Democratic Party (Japan)
- Tricolour Flame, formed after the formation of National Alliance (Italy)
- True Whig Party
Communist rump parties often a result of the transition of communist parties to social democracy: