“Voters' preexisting opinions shift to align with political party positions”. Association for Psychological Science (2 November 2018). 8 August 2020閲覧。 “In 2015, New Zealand held a referendum on changing the national flag, an issue that quickly became polarized along party lines. John Key, the New Zealand Prime Minister and leader of the centre-right National Party at the time, advocated for changing the flag design, while, Andrew Little, the leader of the centre-left Labour Party at the time, opposed the change.”
