leader. While he remained the party's leader, the Parliamentary Leader of the Opposition was Tom Marsters. At the 26 September 2006 elections, the party won 45.3% of the popular vote and 7 out of 24 seats, making it is the largest opposition party. In July 2010 following a dispute about candidate selection, Avatiu/Ruatonga MP Albert (Peto) Nicholas left the party and founded the Party Tumu. The breakaway party attracted the support of influential CIP backer Tupui Ariki Henry, son of CIP founder and former Prime Minister Albert Henry. CIP won the 2010 and 2014 elections, leading to two terms as Prime Minister for Henry Puna. The 2018 election resulted in a hung parliament. Electoral performance Legislative Assembly Leaders Albert Henry (1964–1979) Geoffrey Henry (1979–2006) Henry Puna (2006–2020) Mark Brown (2020-current) References Further reading External links Official website Nationalist parties in Oceania Political parties in the Cook Islands Main Political parties established in 1964 1964 establishments in the Cook Islands