He represented the Marguerite-D'Youville district in the National Assembly of Quebec from 2007 to 2008 as a member of the Action démocratique du Québec.
From 2004 to 2007, Diamond, a law student at Université de Montréal and a resident of Boucherville, served as President of the Youth Commission of the ADQ.
[3] Diamond was elected with 37% of the vote, defeating PQ candidate Sébastien Gagnon (31%) and Liberal incumbent Pierre Moreau (27%).
[4] On April 19, 2007, he was selected to be the Official Opposition's Shadow Minister of Environment and Sustaining Development.
[2] Source: Official Results, Le Directeur général des élections du Québec.