In 2001 he won the North Eastern General electorate for the Soqosoqo Duavata ni Lewenivanua of Laisenia Qarase, becoming the first Banaban elected to the Fijian House of Representatives. In the following election, held on 6–13 May 2006, however, he was defeated by Robin Irwin. Christopher's former constituency was one of three reserved for "General Electors" - Fijian citizens who are not of ethnic Fijian, Indian, or Rotuman descent.
According to Ministry of Justice, he is nominated on 29 April 2020 with the name of Kariamakin Airu Christopher to the Maneaba ni Maungatabu, but he cannot participate to the first session of the House on 22 May 2020.
- Frankel, Yehonatan Shimʻon; Frankel, Jon; Firth, Stewart (2007). From election to coup in Fiji: the 2006 campaign and its aftermath. Canberra, Australia: Asia Pacific Press. pp. xxvi–xxvii. ISBN 0-7315-3812-9.