Moxon stood as the
Māori Party candidate for the
Hamilton West electorate at the
2005 general election, gaining 379 votes to finish fifth in a 10-candidate race. At that election, she was ranked 25th on the Māori Party list, and was consequently not elected. In 2009, Moxon was the Māori Party electorate co-chair for the
Tainui electorate. In the
2013 local-body elections, Moxon stood as an independent candidate for the
Hamilton City Council for one of six seats representing the West Ward. Out of 23 candidates she finished 12th, with 3081 votes. In the
2020 general election, Moxon was a list candidate for the Māori Party, with a ranking of 11. With the Māori Party winning 1.2% of the vote, she was not elected to Parliament. During the
2023 New Zealand general election, Moxon was a list candidate for Te Pāti Māori and was ranked 20th place on the party list. Due to her low ranking, she was not elected into Parliament. In December 2023, Moxon and
Janice Kuka filed a claim with the
Waitangi Tribunal challenging the
Sixth National Government's plans to dissolve
Te Aka Whai Ora (Māori Health Authority), claiming it constituted a breach of the
Treaty of Waitangi. In late November 2025, Moxon submitted a complaint against New Zealand to the
United Nations'
Committee on the Elimination of Racial Discrimination (CERD). She criticised the New Zealand government for implementing various laws and policies which she alleged discriminated against Māori including the disestablishment of the Māori Health Authority, the removal of targeted
bowel cancer screening, the repeal of
anti-smoking legislation, a review of references to the
Treaty of Waitangi in legislation,
boot camps for youth offenders, the
Fast-track Approvals Act 2024, efforts to disestablish the
Māori wards and constituencies and downgrading the Treaty of Waitangi,
Māori language and indigenous history in schools and government agencies. In late November 2025, the CERD committee in
Geneva heard submissions from both Māori community leaders and representatives of the New Zealand government including
Justice Minister Paul Goldsmith, and questioned both sides. In early December 2025, the CERD committee released a report expressing concern that multiple government policies affecting Māori could weaken the implementation of the radical discrimination convention. Moxon praised the report, saying that "CERD is clear: New Zealand is moving backwards on racial equality, and Māori rights are under serious threat." == Personal life ==