Home to some of the most culturally diverse communities in Australia, the seats of Reid, Parramatta and Lindsay in western Sydney are a tantalising prospect for the major parties. Traditionally Labor heartland, the demographic changes have resulted in marginal seats that can be flipped by the right candidate. So will the pitch of either of the major parties be effective this election?Guardian Australia reporters Michael McGowan and Mostafa Rachwani talk to voters in the marginal seats about issues they care about and explain to Laura Murphy-Oates why western Sydney is the ‘golden goose’ of the election